Artist's impression of future BMD ship (JSDF Photo)
Class overview
NameAegis system equipped vessels (ASEV)
Operators Japan Maritime Self-Defense Force
Cost1 trillion yen ($7.1 billion USD) both ships (est.)
Planned2
General characteristics
Displacement12,000 t (12,000 long tons) standard
Length190 m (620 ft)
Beam25 m (82 ft)
Speed30 knots (56 km/h)
Complement110 (total)
Sensors and
processing systems
Electronic warfare
& decoys
Armament
Aircraft carriedMitsubishi SH-60J/K/L
Aviation facilitiesFlight deck and enclosed helicopter hangar
NotesBallistic Missile Defense (BMD)

Aegis system equipped vessels (ASEV) or (Japanese: イージス・システム搭載艦) are a proposed pair of ballistic missile defense (BMD) warships to be operated by the Japanese Maritime Self-Defense Force (JMSDF) as dedicated sea-based BMD platforms, serving as an alternative to Japan's now-cancelled land-based Aegis Ashore BMD system.[Note 1]

Background

Two East Asian nations have nuclear weapons and the means to delivery such weapons — The People's Republic of China (PRC) and the Democratic People's Republic of Korea (DPRK) or North Korea. The range of PRC and DPRK missiles are illustrated below.

Chinese and North Korean missile ranges

People's Republic of China

The first of China's nuclear weapons tests took place in 1964,[2] and its first hydrogen bomb test occurred in 1967.[3] Tests continued until 1996,[4] when China signed the Comprehensive Test Ban Treaty (CTBT) although the PRC is not a signatory of any multilateral nuclear arms limitation or reduction treaties.[5] The People's Liberation Army Rocket Force (PLARF; Chinese: 中国人民解放军火箭军; pinyin: Zhōngguó Rénmín Jiěfàngjūn Huǒjiàn Jūn) controls China's arsenal of land-based ballistic missiles—both nuclear and conventional. The armed service branch was established on 1 July 1966 and made its first public appearance on 1 October 1984. The headquarters for operations is located at Qinghe, Beijing. The PLARF is under the direct command of the Chinese Communist Party's Central Military Commission (CMC).[6] The People's Liberation Army Navy Submarine Force (PLANSF) is the submarine service of the People's Liberation Army Navy (PLAN) and controls submarine-launched ballistic missile forces of the PRC.[7]

In an online article dated 13 January 2023, research associate Timothy Wright of the International Institute of Strategic Studies (IISS) wrote that PRC has "significantly" boosted its strategic nuclear capabilities with ongoing upgrades to its submarine-launched and land-based nuclear forces, noting recent confirmation from recent official statements and published analysis from the U.S. Department of Defense. The article also stated that the DoD raised its estimates of ICBM missile silos from 100 in 2022 to 300 in 2022 based on current trends. The DoD also estimated that the PRC had over 400 "operational" nuclear warheads in its inventory as of 2022 and could reach 1500 by 2035.[8]

Democratic People's Republic of Korea

Trajectories of North Korean missiles launched over Japan, 1998–2017
Range and altitude of North Korean missiles launched over Japan (2017)

North Korea showed an interest in developing nuclear weapons dating back to the 1950s.[9] The nuclear program can be traced back to about 1962, when North Korea committed itself to what it called "all-fortressization", which was the beginning of the hyper-militarized North Korea of today.[10] In 1963, North Korea asked the Soviet Union for help in developing nuclear weapons, but was refused. The Soviet Union agreed to help North Korea develop a peaceful nuclear energy program, including the training of nuclear scientists. Later, China, after its nuclear tests, similarly rejected North Korean requests for help with developing nuclear weapons.[11] The Korean People's Army Strategic Force (Korean: 조선인민군 전략군), is the military branch of the Korean People's Army that oversees North Korea's nuclear and conventional strategic missiles. It is mainly armed with surface-to-surface missiles of domestic design as well as older Soviet and Chinese models. The KPA Strategic Force was established in 1999 when several missile units under KPA Ground Force Artillery Command were re-organized into a single missile force reporting directly to the office of the Supreme Commander of the KPA via the General Staff.[12][13]

As of early 2020, North Korea's nuclear arsenal is estimated approximately 30 to 40 nuclear weapons and sufficient production of fissile material for six to seven nuclear weapons per year.[14] North Korea has also stockpiled a significant quantity of chemical and biological weapons. In 2003, North Korea withdrew from the Treaty on the Non-Proliferation of Nuclear Weapons (NPT).[15] Since 2006, the country has been conducting a series of nuclear weapon tests at increasing levels of expertise and frequency, prompting the imposition of sanctions.[16] More recently, on September 9, 2022, North Korea passed a law to declare itself a nuclear weapons state and rejected any possibility of denuclearisation.[17] In December 2022, North Korea ground-tested a solid-propellant rocket motor for potential use on either a land-based or submarine-launched Intercontinental ballistic missile (ICBM).[18]

As of 20 March 2020, North Korea has carried out 147 tests of strategic missiles since its first such test in 1984.[19] 15 were carried out under the rule of Kim Il Sung and 16 under Kim Jong Il.[20] Under Kim Jong Un, 119 tests have been undertaken as of December, 2019.[21] An additional 8 missiles in 2021 and 63 in 2022 were subsequently launched (See bar chart below.), and a total of 7 North Korean missiles flew over the Japanese archipelago since 1998 (See table below, and the map and graph on the right.).[18]

In its published overview for the Fiscal Year 2023 budget, the Japanese Ministry of Defense (MOD) noted that nine ballistic missiles were launched on 4 August 2022 alone, with five landing within Japan's exclusive economic zone (EEZ) while also noting the DPRK's new "hypersonic" Hwasong-17 ballistic missile system.[22] On 3 November 2022, North Korea reportedly fired at least one ballistic missile off its east coast, including one believed to be a long-range missile, that flew over and past Japan. The launch triggered the Japanese emergency broadcast system, which alerted residents in the prefectures of Miyagi, Yamagata, and Niigata to stay indoors.[23][24] Later, on 18 November 18, 2022, North Korea reportedly fired at least one ballistic missile into the sea on Friday, believed to be the first successful full flight of its Hwasong-17.[25] The missile landed in Japan's exclusive economic zone.[26]

Through the end of March, North Korea has launched a combination of at least 2 long-range and 11 short-range ballistic missiles, as well as multiple cruise missile firings, in 2023 thus far, with the Hwasong-15 ICBM launched on 18 February 2023 travelling for approximately 989 kilometres (615 mi) at a "lofted angle" before landing in the sea just west of Japan.[27] On 13 April 2023, North Korea launched an additional missile, while residents of Hokkaido were told to seek immediate shelter following statements by Kim Jong-Un wherein he called for "more practical and offensive" capabilities.[28]

On 19 November 2023, ROK Defense Minister Shin Won-sik informed the Korean Broadcasting System that an anticipated third satellite launch by North Korea was expected by the end of that month.[29] On the evening of 21 November 2023, North Korea's state-run Korean Central News Agency (KCNA) reported that a Chŏllima 1 rocket carrying a Malligyong-1 reconnaissance satellite was launched from the Sohae Satellite Launching Station, with North Korean leader Kim Jong Un present.[30] On 23 November 2023, North Korea terminated the bi-lateral 2018 Comprehensive Military Agreement in response to South Korea's decision to suspend a part of that agreement in reaction to North Korea's latest satellite launch.[30][31]

On 18 December 2023, South Korea said North Korea has fired its most advanced intercontinental ballistic missile. The launch came a week after South Korean and U.S. defense officials met to update plans on how to respond to a nuclear attack from the North. South Korean and Japanese officials said the missile travelled for 73 minutes, covering about 1,000km (621 miles).[32]

North Korean rockets flown over the Japanese archipelago
No. Date Model Area flown over Advance notice North Korean claim Satellite name
1 August 31, 1998Taepodong-1AkitaNoSatellite launchKwangmyŏngsŏng-1
2 April 5, 2009Unha-2Akita, IwateYesSatellite launchKwangmyŏngsŏng-2
3 December 12, 2012Unha-3OkinawaYesSatellite launchKwangmyŏngsŏng-3
4 February 7, 2016Kwangmyŏngsŏng (Unha-3)OkinawaYesSatellite launchKwangmyŏngsŏng-4
5 August 29, 2017Hwasong-12HokkaidoNoMissile launchN/A
6 September 15, 2017Hwasong-12HokkaidoNoMissile launchN/A
7 October 4, 2022Hwasong-12 (presumed)AomoriNo

Note: Text, table, and graphics copied from List of North Korean missile tests; see that page's history for attribution.

Japanese Aegis Ashore program

Japan began developing its current ballistic missile (BDM) system starting in 2004.[33] On 19 December 2017, the Cabinet of Japan approved a plan to purchase two Aegis Ashore systems equipped with the AN/SPY-7(V)1, based on Lockheed Martin's Long Range Discrimination Radar (LRDR) to increase Japan's self-defence capability against North Korea, using SM-3 Block IIA missiles, and also could work with SM-6 interceptors capable of shooting down cruise missiles.[34][35][36] The installation sites are at a Ground Self-Defense Force training area in Araya District, Akita Prefecture and the Mutsumi training area in Hagi, Yamaguchi Prefecture (See Map, Red: BMD FPS-5 radar, Yellow: BMD FPS-3 Kai radar, Blue: Air Defense Group, Anchor: JMSDF Aegis destroyers).[37]

The proposed Japanese Aegis Ashore program would have been comparable to the land-based Aegis Ashore Ballistic Missile Defense System (AABMDS) sites deployed by the U.S. in Romania (pictured) and Poland (pictured). Test installation was built at the U.S. Pacific Missile Range Facility in Hawaii (pictured) in the 2000s. A site in Deveselu, Romania is operational since 2016, while a site at Redzikowo, Poland was slated to become operational in 2022.[38][39]

On 30 July 2018, Japan picked Lockheed Martin Corp to build a US$1.2 billion radar for two ground-based Aegis ballistic missile defense stations. These are meant to guard against missile strikes.[40] On the same day, Japan's Defense Ministry considered to withdrawing PAC-3 missile interceptor units from the country's northern and western region amid an easing of tensions with North Korea. Ministry officials noted that North Korea is less likely to fire ballistic missiles after it held a summit with the United States on the previous month. But the officials also said the ministry will maintain its order to destroy any incoming missiles. They added that the ministry will be ready to quickly redeploy the PAC-3 units if the situation changes.[41]

Japan's Foreign Minister Hirofumi Nakasone and South Korea's Minister of Foreign Affairs Yu Myung-hwan agreed that the launch[42] of the North Korean Unha-2 satellite on April 5, 2009, violated United Nations resolutions 1695 and 1718, both adopted in 2006. Japan's cabinet examined approval of a JMSDF AEGIS BMD engagement in the event of a failure of the Taepondong launch.[43][44][45] The Japanese government also noted that it could bypass the Japanese Cabinet for an interception under Article 82, Section 2, Paragraph 3 of the Self-Defence Forces law.[46] In total, five AEGIS destroyers were deployed at that time.[47] Supplemental to SM-3 capability the Japanese system incorporates an airborne component. Together discrimination between platform tests and satellite launches is possible by analyzing the angle of ascent.[48]

On 15 June 2020, Japanese Defense Minister Taro Kono announced that work had been halted on the deployment of the Aegis Ashore system because additional costs would be needed to ensure that residential buildings would not be hit by rocket boosters used to launch the missiles.[49] Later in the month Japan's National Security Council confirmed the cancellation of Aegis Ashore.[50] On 23 September 2020, Lockheed Martin noted the potential expense to convert the anti-aircraft (AA) system for maritime use since a revamp in the design is required.[51] The JMSDF has equipped four ships of the Kongo-class destroyers for Long-Range Surveillance Team (LRST) and engagement — JS Kongo, JS Chokai, JS Myoko, and JS Kirishima.[52][53]

JMSDF Aegis Afloat

BMD maneuvers (October 6, 2022)
JS Haguro(DDG-180)launching SM-3 Block IB missile (November 19, 2022)

The JMSDF currently operates 4 Kongō class, 2 Atago class, and 2 Maya class guided-missile destroyers as part of its "Aegis Afloat" program (See table below.).

On 6 October 2022, five warships from the United States, Japan, and South Korea held a multilateral ballistic missile defense exercise in the Sea of Japan (pictured) as part of the military response to ongoing North Korean intermediate-range ballistic missile tests over the Japanese home islands.[54][55]

On 16 November 2022, the guided-missile destroyer Maya fired an SM-3 Block IIA missile, successfully intercepting the target outside the atmosphere in the first launch of the missile from a Japanese warship. Two days later, the Haguro likewise fired an SM-3 Block IB missile with a successful hit outside the atmosphere. Both test firings were conducted at the U.S. Pacific Missile Range Facility on Kauai Island, Hawaii, in cooperation with the U.S. Navy and U.S. Missile Defense Agency. This was the first time the two ships conducted SM-3 firings in the same time period, and the tests validated the ballistic missile defense capabilities of Japan's newest Maya-class destroyers.[33][56]

On 22 February 2023, five warships from the United States, Japan, and South Korea held a multilateral ballistic missile defense exercise in the Sea of Japan in response to the launch of a North Korean Hwasong-15 ballistic missile on 18 February 2023, landing in Japan's exclusive economic zone (EEZ) in the Sea of Japan, in an area 125 miles west of the island of Ōshima, which lies 30 miles (48 km) west of the main island of Hokkaido. Two additional IBCBMs were subsequently launched on 20 February 2023, with both landing in the Sea of Japan off the east coast of the Korean Peninsula.[57] On 19 December 2023, United States, Japan, and South Korea announced the activation of a real-time North Korea missile warning system as well as jointly established a multi-year trilateral exercise plan in response to North Korea's continued ballistic missile launches.[58][59]

List of Aegis Afloat ships
NameHull Pennant No.Builder/ShipyardAegis RadarAnti-Ballistic MissileVertical LaunchersCommissiomedHome portFlotillaSquadronStatus
Maya class
JS Maya DDG-179 JMU, Yokohama AN/SPY-1D(V) SM-3 Standard missile Mark 41: 96 cells (total) 19 March 2020 Yokosuka Escort Flotilla 1 Escort Squadron 1 Active
JS Haguro DDG-180 JMU, Yokohama AN/SPY-1D(V) SM-3 Standard missile Mark 41: 96 cells (total) 19 March 2021 Sasebo Escort Flotilla 4 Escort Squadron 8 Active
Atago class
JDS Atago DDG-177 JMU, Yokohama AN/SPY-1D(V) SM-3 Standard missile Mark 41: 96 cells (total) 15 March 2007 Maizuru Escort Flotilla 3 Escort Squadron 3 Active
JDS Ashigara DDG-178 JMU, Yokohama AN/SPY-1D(V) SM-3 Standard missile Mark 41: 96 cells (total) 13 March 2008 Sasebo Escort Flotilla 2 Escort Squadron 2 Active
Kongō class
JDS Kongō DDG-173 Mitsubishi Heavy Industries AN/SPY-1D PESA SM-3 Standard missile Mark 41: 90 cells (total) 25 March 1993 Sasebo Escort Flotilla 1 Escort Squadron 5: Active
JDS Kirishima DDG-174 Mitsubishi Heavy Industries AN/SPY-1D PESA SM-3 Standard missile Mark 41: 90 cells (total) 16 March 1995 Yokosuka Escort Flotilla 2 Escort Squadron 6 Active
JDS Myōkō DDG-175 Mitsubishi Heavy Industries AN/SPY-1D PESA SM-3 Standard missile Mark 41: 90 cells (total) 14 March 1996 Maizuru Escort Flotilla 3 Escort Squadron 3 Active
JDS Chōkai DDG-176 IHI Corporation AN/SPY-1D PESA SM-3 Standard missile Mark 41: 90 cells (total) 20 March 1998 Sasebo Escort Flotilla 4 Escort Squadron 8 Active

Design

CGH-67 design (1986)
U.S. Navy proposed DDG(X) destroyer

In 2020, Japanese Defense Minister Nobuo Kishi announced plans to build 2 new Aegis destroyers to replace its scrapped land-based Aegis Ashore ballistic missile interceptors program.[60][61] On August 31, 2022, the Japan Ministry of Defense announced that JMSDF will operate two "Aegis system equipped ships" (イージス・システム搭載艦 in Japanese) to replace its earlier cancellation of the Aegis Ashore program, commissioning one ship by the end of fiscal year 2027, and the other by the end of FY2028. The budget for design and other related expenses are to be submitted in the form of “item requests” (i.e., engine components), without specific amounts, and the initial procurement of the lead items are expected to clear legislation by FY2023. Construction is to begin in the following year of FY2024.[62][60][63][64][65] The overall cost of building both ships is estimated to be 1 trillion yen (US$7.1 billion).[60][66] The first ship is planned to be commissioned in 2028 and the second in 2029.[33]

Initial SWATH design approach

Preliminary design postulated that the ASEV would be based on the Small Waterplane Area Twin Hull (SWATH) configuration used by Hibiki-class ocean surveillance ships, with the combined main deck area sufficient to accommodate the Aegis radar deckhouse and battery of SM-6 interceptor missile launchers.[65] Such a SWATH-based configuration would be comparable to the 1986 CGH-67 design study (pictured) by the then David W. Taylor Naval Ship Research and Development Center of the U.S. Navy's Naval Sea Systems Command (NAVSEA) albeit without the explicit BMD orientation.[67]

Current design

Original plans for the two ASEV ships called for a cruiser-sized warships with a standard displacement of 20,000 long tons (20,000 t) each, an overall length of 690 ft (210 m), and a beam of 130 ft (40 m) on a monohull configuration. The overall size offers enhanced habitability for its 110-person crew for extended deployments and relative simplicity in construction, and it is designed to provide a stable platform for its advanced sensors and weapon systems. Once completed, the two warships will be the largest surface combatant ships in service with the JMSDF, and according to Popular Mechanics, they will "arguably [be] the largest deployable surface warships in the world."[62][60][63][64]

However, in November 2022, both Kyodo News and Jiji Press quoted an unnamed senior official in Japan's Ministry of Defense who noted that the proposed ASEV warships might be downsized in a size similar to Maya-class destroyers as their original proposed beam significantly reduced speed and maneuverability, making the ships easier to detect and target by the enemy.[68][69][70] Later, on 23 December 2022, the Japanese MOD released additional 2023 budget and program guidance, including the first official illustration of the ASEV warship (See article info-box.), although no further details on ASEV ship dimensions were provided beyond the original facts and figures from the August 2022 release.[71][72][73][74] USNI news editor Sam LaGrone noted that the overall design of the ASEV warship was comparable to the U.S. Navy's next-generation DDG(X) guided-missile destroyer (pictured).[71]

Procurement

According to its published budget overview, for Fiscal Year 2023, the Japanese Ministry of Defense allocated 22.8 billion yens (US$1.654 billion) for the initial procurement of advanced components for the ASEV program in order to "significantly improved BMD capability capable of responding to lofted and simultaneous ballistic missiles, as well as expandability for responding to HGVs and other such threats."[75] In related news, in a statement released on April 4, 2023, the Japanese Ministry of Defense announced the signing of four contracts worth 382.47 billion yens (US$2.83 billion) last week with Mitsubishi Heavy Industries (MHI) for development of standoff defense weapon systems for the Japanese Self Defense Force (JSDF). This standoff defense capability is expected to provide the JSDF with long-range strike capabilities against ships and amphibious forces invading Japan, particularly at its remote islands, such as the disputed Senkaku Islands administered by Japan, and its southwestern islands.[76]

On 19 December 2023, Defense Minister Minoru Kihara announced approval for the funding for the construction of Aegis System Equipped Vessels (ASEV) in Fiscal Year 2024 and FY 2025 to be commissioned in 2027 and 2028 respectively. Initial FY 2024 ASEV funding was set at 373.1 billion yen (US$2.6 billion), a slight reduction from the 379.7 billion yen (US $2.64 billion) that the Japanese Ministry of Defense had sought in its initial FY 2024 budget request submitted in August 2023.[77] This ASEV procurement decision was subsequently affirmed when the Japanese Cabinet approved the Ministry of Defense's budget for Fiscal Year 2024 on 22 December 2023.[78]

Equipment

Proposed BMD profile (JSDF image)
Standard SM-6 missile components
An example of integrated electric propulsion used in the Type 45 destroyer
(GT: gas turbine; DG: diesel generator)

Ballistic missile defense systems

As a ship-based alternative to the land-based Aegis Ashore system, the Aegis system-equipped warships could be armed with the Standard Missile 6 (SM-6) Sea-Based Terminal (SBT) system (pictured), as well as the J7.B Aegis Weapon System and Lockheed Martin's SPY-7(V)1 multi-functional radar, initially contracted for Aegis Ashore. According to Lockheed Martin, J7.B is the integration of SPY-7 into J7 (BL9), the latest software currently installed on JMSDF's Aegis-equipped guided missile destroyers.[65][79][80] The SPY-7(V)1 radar uses scaled equipment and software derived from the advanced Long Range Discrimination Radar (LRDR) located in the Clear Space Force Station, Alaska, and operated by the U.S. Missile Defense Agency (MDA).[80]

In support of this objective, on 20 October 2022, the U.S. Department of State approved and the Defense Security Cooperation Agency (DSCA) notified the United States Congress that Japan is set to be the first country after the United States to field the Standard Missile 6 (SM-6) as part of a proposed US$450 million Foreign Military Sale (FMS) arms package. Pending Congressional approval, Japan was conditionally approved to buy up to 32 of the Raytheon-built SM-6 Block I missiles. This notification is a follow-up of a 2017 decision from U.S. Department of Defense that conditionally approved Japan, South Korea, and Australia to buy SM-6 missile systems.[81][82]

Weapon systems

The ASEV warships will be equipped to defend against hypersonic glide vehicles, as such new hypersonic missile designs are too evasive for current ballistic missile defense systems to reliably intercept.[60][63] Also, the two ships will be equipped with the upgraded sea-based version of the Type-12 anti-ship cruise missile (ASCM) system capable of striking land and naval targets with a range of around 1,000 km (540 nmi; 621 mi).[60][83] Given the manpower requirements, non-BMD armament may be limited to such close-in self-defense weapon systems as Phalanx CIWS or SeaRAM.[65]

On 16 December 2022, Defense Buildup Program (防衛力整備計画) document announced a 110.4 billion yen (US$820 million) budget allocation to modify the JMSDF's Aegis-equipped guided missiles destroyers to carry Tomahawk land attack cruise missiles (TLAM). Although it is not stated what specific modifications are to be undertaken, Lockheed Martin's Tactical Tomahawk Weapons Control System (TTWCS) is the likeliest system to be integrated into the Aegis destroyers.[84] The Japanese government had previously approached the U.S. government to purchase the U.S.-made Tomahawk cruise missile for attacking enemy bases. The Japanese government decided to purchase the Tomahawk cruise missile before their domestically built improved range Type 12 Surface-to-Ship Missile systems started full-scale operation.[85] The intent behind the JMSDF acquiring both long-range cruise missile systems is to act as a deterrent to North Korea, with the weapons able to strike naval and land targets.[86]

In a tweet posted on 17 December 2022, Satō Masahisa, Director, Committee on Foreign Affairs and Defense of the House of Councillors in the Diet, stated that the proposed ASEV warships would be capable of speeds in excess of 30 knots (56 km/h); Standard Missile 6 (SM6) and Evolved SeaSparrow Missile (ESSM) systems; 12 anti-ship standoff missiles; Cooperative Engagement Capability (CEC) and Engage-on-Remote (EoR) functions; and now 128 VLS cells.[1][87] On 23 December 2022, the Japanese Ministry of Defense released its 2023 budget and program guidance that featured the first official illustration of the ASEV warship, revealing that its missile arsenal will use the Mark 41 Vertical Launching System (Mk 41 VLS) grouped in two locations, forward of the bridge deckhouse and aft above the helicopter hangar.[71][72][73][74]

On 17 November 2023, the U.S. Department of State announced the sale of up to 200 Tomahawk Block IV All Up Rounds (AURs) (RGM-109E) cruise missiles, 200 Tomahawk Block V AURs (RGM-109E) cruise missiles, and 14 Tactical Tomahawk Weapon Control Systems to the Japanese Ministry of Defense as part of a part of a US$2.35 billion foreign military sales package. On month previously Japanese Defense Minister Minoru Kihara indicated a planned buy of Block IV Tomahawks in FY2025 and Block V in FY2026 and FY2027, thereby advancing acquisition Block IV acquisition by a year. In a press conference on 20 November 2023, Kihara stated that the Defense Ministry would coordinate closely with United States in the delivery of the Tomahawk missile system on its sea-based and ground platforms.[29]

Ship sensor systems

The ASEV warships will use the UNIted COmbined Radio aNtenna (UNICORN) NORA-50 integration mast, which has a bar-shaped dome that houses the antennas for tactical data link, Tactical Air Navigation System (TACAN), and communications. According to the Acquisition, Technology & Logistics Agency (ATLA), UNICORN has a shape designed to reduce the radar cross section (RCS), which makes it stealthy. It is currently being installed on the Mogami-class frigates entering service or under construction, and there is a possibility that they will be considered for integration into the proposed Next-Generation Offshore Patrol Vessel program.[1] [88]

Propulsion & power systems

Given the manning and electrical requirements, the Aegis system equipped vessels (ASEV) may require a highly automated, low maintenance, all-electrical propulsion systems such as:

Given the lack of specific institutional expertise, technical support infrastructure, and political considerations, it is highly unlikely that the ASEV warships will use nuclear power for propulsion such as the Bechtel Corporation A1B nuclear reactor developed for the United States Navy's Gerald R. Ford-class aircraft carriers to provide electrical power and propulsion. The released official illustration of the ASEV warship (pictured) displays a very prominent smokestack, strongly suggesting a non-nuclear propulsion plant in operation.

Operational concept

Examples of operations (JSDF image)

On 16 December 2022, the Japanese Cabinet approved a trio of defense-related policy documents, including its new National Security Strategy (NSS or 国家安全保障戦略), the strategic guideline document for the Japanese government's policies regarding diplomacy, defense, and economic security for the next decade. Based on the NSS, the National Defense Strategy (NDS or 国家防衛戦略) document outlined Japan's defense policy goals and the means to achieve them while the Defense Buildup Program (DBP or 防衛力整備計画) document outlined the scale of the introduction of specific defense equipment within the budgetary objectives. According to the Defense Buildup Program document, the JMSDF will increase the number of Aegis-equipped guided-missile destroyers (DDG) from the current 8 to 10 warships, as well as the introduction of two Aegis system-equipped vessels (ASEV) to be deployed in ballistic missile defense (BMD) operations. By the end of the decade, the JMSDF will operate 12 ships equipped with Aegis Weapon System (AWS) and likewise plans to replace its fleet of older, less capable destroyers and destroyer escorts with Mogami-class frigates.[84][89][90][91]

On 23 December 2022, the Japanese Ministry of Defense's 2023 budget and program guidance documented provided examples of operations (運用の一例) for the Aegis-equipped naval forces of the Japanese Maritime Self Defense Force (MSDF). The two ASEV warship would be exclusively tasked for dedicated ballistic missile defense (BDM) missions (BMD等) and operate off the Korean peninsula in the Sea of Japan, allowing the other Aegis guided-missile destroyers to meet other contingencies (侵攻阻止) while operating independently to maintain the maritime domain awareness (MDA) and keep the sea lines of communication (SLOC) open in the East China Sea southwest of the Japanese home islands (pictured).[71][72][73][74][77][90][91]

Criticisms

Senior research fellow Brent Sadler of The Heritage Foundation criticized the proposed ASEV program, noting that the total of two units was insufficient to keep an AESV ship deployed continuously at sea. Sadler noted that the more typical operational cycle would require at least three ships, with one ship at sea on deployment, a second ship undergoing refit and upkeep following deployment, and a third ship going through work-up for deployment to relieve the first ship. Sadler also noted that the 2027–2029 timeframe to complete the construction of both AESV ships leaves Japan highly vulnerable during the interim period.[92] Regarding Japan's relative vulnerability, StrategyPage noted that the original Aegis Ashore BMD land-based facilities would not have been operational until 2024.[93]

Additionally, senior defense analyst Felix Chang of the Foreign Policy Research Institute (FPRI) observed that the proposed ASEV warships would be extremely vulnerable to such next-generation Chinese anti-ship ballistic missiles as the DF-21D and DF-26, with DF-21D having a range of 1,500 kilometers while the DF-26 has a range of 4,000 kilometers. Chang also mentioned that China has fitted its DF-21D missiles with maneuverable reentry vehicles that guide with terminal seekers to compensate and correct for any inaccurate targeting data.[66]

Finally, senior fellow Zack Cooper of the American Enterprise Institute pointed out that a sea-based BMD system is overall not a more cost-effective alternative to a shore-based system.[33] In 2020, Japanese news media reported that officials within the Japanese Ministry of Defense recognized that alternatives to the land-based Aegis Ashore system would all be significantly more expensive, by up to half again as costly.[94]

Ships in the class

Building No.NameHull Pennant No.Builder/ShipyardPlanLaid downLaunchedCommissionedHome portFlotillaSquadronStatusNote
TBDUnit 1TBDMitsubishi Heavy Industries (MHI)20232024 (est.)TBD2027 (est.)TBDTBDTBDAuthorized[1][74][77][91]
TBDUnit 2TBDJapan Marine United (JMU)2023TBDTBS2028 (est.)TBDTBDTBDAuthorized[1][74][77][91]

Naming conventions

Neither ASEV warship has been officially named. Ships of the JMSDF are known as Japan Ships (護衛艦; Go'[e]i:-Kan) and are classified according to the warship type. Guided-missile destroyers (DDG) are named after the names of places in Japan, such as mountains and provinces while more conventional destroyers (DD) are named after natural phenomena in the heavens or the atmosphere as well as mountains, rivers or regions. It is not known if ASEV warship will have a new type designation such as guided-missile cruiser (CG) or ballistic missile defense ship (BMD Ship).

See also

Notes

  1. When constructed, these ASEV warship will be the only operational ballistic missile defense ships (BMD ship) afloat. Previously, Huntington Ingalls Industries had proposed to the U.S. Navy that a BMD variant of the San Antonio-class amphibious transport dock be considered armed with 288 Mk-41 VLS missile tubes and a BMD radar with 1000 times the sensitivity of the AN/SPY-1 radar of the Arleigh Burke-class destroyers. Also, between 1967–1969, the U.S. Navy had proposed a sea-based anti-ballistic missile intercept system (SABMIS) consisting of surface ships armed with anti-ballistic missile (ABM) systems, but this program was subsequently prohibited by the ratification of the ABM Treaty.

References

  1. 1 2 3 4 5 6 7 8 9 Yoshihiro Inaba (3 June 2023). "Japan's New ASEV Ships Will Boast An Impressive 128 VLS Cells". NavalNews. Retrieved 23 June 2023.
  2. "我國第一顆原子彈爆炸成功--中國共產黨新聞--中國共產黨新聞網". cpc.people.com.cn. Retrieved 2023-01-01.
  3. "我國第一顆氫彈爆炸成功--中國共產黨新聞--中國共產黨新聞網". cpc.people.com.cn. Retrieved 2023-01-01.
  4. "中國最後一次核試驗 | 當年今日 | 今日焦點". 當代中國. Retrieved 2023-01-01.
  5. "中国签署《全面禁止核试验条约》".
  6. Xiu, Ma (24 October 2022). PLA Rocket Force Organization (PDF) (Report). China Aerospace Studies Institute.
  7. "China Naval Modernization: Implications for U.S. Navy Capabilities—Background and Issues for Congress Updated July 30, 2020" (PDF). Retrieved 14 August 2020.
  8. Timothy Wright (13 January 2023). "China beyond minimum deterrence; reading Beijing's nuclear developments". International Institute of Strategic Studies. Retrieved 2023-01-25.
  9. Jackson, Van (2018). On the Brink: Trump, Kim, and the Threat of Nuclear War (1 ed.). Cambridge University Press. p. 23. doi:10.1017/9781108562225.002. ISBN 9781108562225. S2CID 226885565.
  10. Samuel Ramani (18 February 2016). "These 5 things help make sense of North Korea's nuclear tests and missile launch". The Washington Post. ISSN 0190-8286. Wikidata Q97341972..
  11. Lee Jae-Bong. "U.S. Deployment of Nuclear Weapons in 1950s South Korea & North Korea's Nuclear Development: Toward Denuclearization of the Korean Peninsula (English version)". The Asia-Pacific Journal. Retrieved April 4, 2012. December 15, 2008 (Korean) February 17, 2009 (English)
  12. "Kim Jong Un Guides Strategic Ballistic Rocket Launching Drill of KPA Strategic Force". KCNA Watch. 30 August 2017.
  13. Pinkston, Daniel A. (February 2008). The North Korean Ballistic Missile Program (PDF). Strategic Studies Institute, US Army. Archived (PDF) from the original on 2014-08-26.
  14. Nuclear Weapons: Who Has What at a Glance, Arms Control Association (updated August 2020)
  15. "North Korea leaves nuclear pact". CNN. January 10, 2003. Archived from the original on February 6, 2016.
  16. North Korea: Overview, Nuclear Threat Initiative (last updated May 2019).
  17. "North Korea declares itself a nuclear weapons state". BBC News. September 9, 2022. Retrieved 2022-09-09.
  18. 1 2 Mary Beth D. Nikitin (January 23, 2003). Report to Congress on North Korea's Nuclear Weapons and Missile Programs In Focus (PDF) (Report). Congressional Research Service. p. 2. if10472. Retrieved January 26, 2003.
  19. "The CNS North Korea Missile Test Database". nti.org. November 30, 2017. Archived from the original on December 4, 2017. Retrieved 2017-12-04.
  20. Cotton, Shea (April 24, 2017). "Understanding North Korea's Missile Tests". nti.org. Archived from the original on December 5, 2017. Retrieved 2017-12-04.
  21. "Missiles of North Korea". Missile Threat. Archived from the original on April 11, 2020. Retrieved 2020-03-28.
  22. "Fiscal Year 2023 Defense Programs and Budget of Japan" (PDF). USNI News Blog. United States Naval Institute. March 30, 2023. p. 4. Retrieved 2023-03-31. English language version; hereafter as MOD FY23 Budget Overview.
  23. "North Korea launches ballistic missile, sparking emergency warnings in Japan". The Guardian. 2022-11-02. Retrieved 2022-11-02.
  24. "North Korea fired one long-range, two short-range missiles -South Korea military". Reuters. 2022-11-03. Retrieved 2022-11-03.
  25. "North Korea's Kim brings daughter to oversee test of suspected Hwasong-17 ICBM". France 24. 19 November 2022. Retrieved 21 November 2022.
  26. "North Korean ICBM lands in Japan's exclusive economic zone, PM says". The Guardian. 2022-11-18. Retrieved 2022-11-18.
  27. Cha, Victor; Kim, Ellen (2023-02-21). "A Busy Weekend of Missile Tests in North Korea".
  28. Johnson, Jesse (12 April 2023). "Japan urges evacuation as North Korean missile heads near Hokkaido". Japan Times. Archived from the original on 12 April 2023. Retrieved 12 April 2023.
  29. 1 2 Mahadzir, Dzirhan (November 20, 2023). "State Dept. Signs off on $2.3B Japanese 'Counterstrike' Tomahawk Missile Buy". News Blog. United States Naval Institute. Retrieved November 20, 2023.
  30. 1 2 Mahadzir, Dzirhan (November 22, 2023). "North Korea Lauches Spy Satellite, Violating UN Security Council Resolution". News Blog. United States Naval Institute. Retrieved November 25, 2023.
  31. Mahadzir, Dzirhan (November 23, 2023). "North Korea Terminates Military Agreement with South Korea". News Blog. United States Naval Institute. Retrieved November 25, 2023.
  32. "North Korea fires most powerful long-range missile after South Korea-US meeting". BBC.
  33. 1 2 3 4 Benjamin Brimelow (15 December 2022). "Japan may build 2 huge warships to counter the growing missile threat from North Korea". Business Insider. Retrieved 16 December 2022.
  34. Japan to buy Aegis Ashore missile defense systems, Mari Yamaguchi, The Associated Press/DefenseNews.com, 2017-12-20
  35. "Japan to expedite study on adopting land-based Aegis system". The Japan Times Online. 29 April 2017. Retrieved 15 January 2018.
  36. "U.S. Government Designates Lockheed Martin's Latest Generation Radar: AN/SPY-7(V)1 – Nov 14, 2019". Media – Lockheed Martin. Retrieved 2019-12-24.
  37. "Japan's defence chief seeks local support to deploy a land-based missile shield". The South China Morning Post. Associated Press. June 23, 2018.
  38. "MDA – Aegis BMD". Missile Defense Agency. November 4, 2017. Retrieved November 4, 2017.
  39. "Poland says U.S. missile shield site delayed until 2020". Reuters. March 22, 2018. Retrieved July 25, 2018.
  40. "Japan picks $1.2 billion Lockheed radar for Aegis Ashore batteries". Reuters. 30 July 2018. Archived from the original on 2018-07-31.
  41. "PAC3 missile defense units to be withdrawn". NHK World-Japan. Archived from the original on 2018-07-30.
  42. North Korea Rocket Flew Over Japan, Government Says (Update1) – Bloomberg
  43. Asia Times Online :: Korea News and Korean Business and Economy, Pyongyang News
  44. Farley, Richard (24 March 2009). "Let's Shoot Something Down!". The American Prospect. Archived from the original on 2012-09-09. Retrieved 2022-10-09.
  45. "Japan to ready defense against N.Korea rocket: Kyodo". Reuters. March 17, 2009. Retrieved 2022-10-10.
  46. "Interception of N. Korean rocket could be ordered by defense minister alone". Archived from the original on 2009-03-26. Retrieved 2009-03-24.{{cite web}}: CS1 maint: unfit URL (link)
  47. Allied Warships on Alert Over N. Korean Rocket Launch
  48. Union of Concerned Scientists: Unha-2 analysis, March 18, 2009
  49. "Kono suspends deployment of Aegis Ashore defense system". Asahi Shimbun. June 16, 2020. Retrieved 2022-10-11.
  50. Yamaguchi, Mari (25 June 2020). "Japan confirms it's scrapping US missile defense system". DefenseNews. Associated Press. Retrieved 26 June 2020.
  51. "ミサイル防衛装備の洋上配備「合理的でない」 米側が指摘 | イージス・アショア | Nhkニュース". www3.nhk.or.jp. Archived from the original on 23 September 2020. Retrieved 12 January 2022.
  52. Swaine, Michael D.; Swanger, Rachel M.; Kawakami, Takashi (2001). "Japan and Ballistic Missile Defense. RAND Report".
  53. Shabalin, Maxim (2011). The Logic of BMD Procurement in Japan (1994–2007) (Thesis). Oxford University, UK.
  54. LaGrone, Sam (October 6, 2022). "UPDATED: Warships from U.S., Japan, South Korea Ballistic Missile Defense Drills After North Korean Missile Shots". News Blog. United States Naval Institute. Retrieved October 11, 2022.
  55. "US Navy, JMSDF And ROK Navy Conduct BMD Exercise". NavalNews.com. October 6, 2022. Retrieved October 25, 2022.
  56. Mahadzir, Dzirhan (November 21, 2022). "Two Japanese Destroyers Score in Ballistic Missile Defense Test off Hawaii". News Blog. United States Naval Institute. Retrieved November 22, 2022.
  57. Mahadzir, Dzirhan (February 22, 2023). "U.S., Japan, South Korea Hold Ballistic Missile Defense Drills after North Korean Launches". News Blog. United States Naval Institute. Retrieved February 22, 2023.
  58. Mahadzir, Dzirhan (December 19, 2023). "U.S., Japan, South Korea Establish North Korean Missile". News Blog. United States Naval Institute. Retrieved December 22, 2023.
  59. "Japan-United States-Republic of Korea Trilateral Ministerial Joint Press Statement". Press Release. Japanese Ministry of Defense. December 19, 2023. Retrieved December 24, 2023.
  60. 1 2 3 4 5 6 Kaigo Narisawa (September 3, 2022). "Defense Ministry not giving up on sea-based Aegis Ashore system". Asahi Shimbun. Retrieved 27 October 2022.
  61. "Japan Defense Ministry plans new Aegis destroyers in place of Aegis Ashore". 24 November 2020. Archived from the original on 1 December 2020. Retrieved 29 December 2020.
  62. 1 2 Kyle Mizokami (12 September 2022). "Japan Defense Ministry plans new Aegis destroyers in place of Aegis Ashore". Popular Mechanics. Archived from the original on 12 September 2022. Retrieved 13 September 2022.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
  63. 1 2 3 Lia Wong (1 September 2022). "Japanese Defense Budget Expansion Includes Two 20,000 Ton Cruisers". Overt Defense. Retrieved 7 September 2022.
  64. 1 2 Dzirhan Mahadzir (6 September 2022). "Japan to Build Two 20,000-ton Missile Defense Warships, Indian Carrier Commissions". USNI News Blog. Retrieved 7 September 2022.
  65. 1 2 3 4 Yoshihiro Inaba (1 September 2022). "Japan's New "Aegis Equipped Ships": What We Know So Far". NavalNews. Retrieved 7 September 2022.
  66. 1 2 Gabriel Honrada (September 6, 2022). "Japan's Aegis Ashore destroyer plan is full of holes". Asian Times. Retrieved 24 October 2022.
  67. Donald McKelvy (26 May 2011). "US Navy CGH-67". Deep Blue to Wild Blue. Retrieved 23 October 2022.
  68. "Japan to downsize 2 planned Aegis destroyers to increase mobility". Kyodo News. 9 November 2022. Retrieved 30 December 2022.
  69. "新イージス艦、小型化検討 「大き過ぎ」批判を考慮―防衛省". Jiji Press. 20 November 2022. Retrieved 30 December 2022.
  70. "Study on downsizing ships equipped with Aegis system "The original plan was the Reiwa battleship Yamato"". The Asahi Shimbun. 18 November 2022. Retrieved 24 January 2023.
  71. 1 2 3 4 LaGrone, Sam (December 27, 2022). "Japanese MoD Releases New Details on Ballistic Missile Defense Ships". News Blog. United States Naval Institute. Retrieved January 3, 2023.
  72. 1 2 3 "Japanese MoD Releases Further Details About Its Future BMD Destroyers". Naval News. December 25, 2022. Retrieved January 3, 2023.
  73. 1 2 3 Emma, Helfrich (December 29, 2022). "First Rendering Of Japan's Ballistic Missile Defense Ship Concept Released". The Drive. Retrieved January 3, 2023.
  74. 1 2 3 4 5 "Defense Programs and Budget of Japan FY Reiwa 5 (2023) Budget Overview" (PDF). Budget overview. Japanese Ministry of Defense. December 23, 2022. p. 15. Retrieved 2023-01-09. In Japanese (防衛力整備計画).
  75. "Fiscal Year 2023 Defense Programs and Budget of Japan" (PDF). USNI News Blog. United States Naval Institute. March 30, 2023. p. 14. Retrieved 2023-03-31. English language version; hereafter as MOD FY23 Budget Overview.
  76. Dzirhan Mahadzir (13 April 2023). "Japan Awards $2.8B in Contracts for New Standoff Weapons". USNI News Blog. Retrieved 13 April 2023.
  77. 1 2 3 4 Mahadzir, Dzirhan (December 20, 2023). "Japan Locks in Funding for 2 New Aegis Destroyers". News Blog. United States Naval Institute. Retrieved December 22, 2023.
  78. Mahadzir, Dzirhan (December 20, 2023). "Japanese Cabinet Approves Largest Ever Defense Budget". News Blog. United States Naval Institute. Retrieved December 24, 2023.
  79. "The SPY-7 Hybrid Defense Security Cooperation Project with Japan Completes Additional Capability Demonstration". Missile Defense Agency. September 13, 2022. Retrieved 23 October 2022.
  80. 1 2 "Japanese Aegis System-Equipped Vessel (ASEV) Successfully Demonstrates J7.B Software Build". Missile Defense Agency. September 13, 2022. Retrieved 14 October 2022.
  81. LaGrone, Sam (October 20, 2022). "Japan Set to Buy SM-6s in Potential $450M Deal, Says State Department". News Blog. United States Naval Institute. Retrieved October 20, 2022.
  82. "JAPAN – STANDARD MISSILE 6 BLOCK I (SM-6 BLK I) MISSILES". Press Release Transmittal No. 22-59. Defense Security Cooperation Agency. October 20, 2022. Retrieved October 21, 2022.
  83. Inder Singh Bisht (15 September 2022). "Japan to Build Aegis-Equipped Ballistic Missile Defense Warships". DefensePost. Retrieved 30 September 2022.
  84. 1 2 Yoshihiro Inaba (3 January 2023). "Japan To Increase The Number Of Aegis Destroyers". NavalNews. Retrieved 13 January 2023.
  85. "Japan in late-stage talks with U.S. for Tomahawk purchase -Yomiuri". Reuters. 2022-10-28. Retrieved 2023-01-13.
  86. Yomiuri Shimbun (17 August 2022). "New Aegis system-equipped ships will likely carry long-range cruise missiles". Japanese News. Retrieved 24 January 2023.
  87. Satō Masahisa (17 December 2022). "New Aegis system-equipped ships will likely carry long-range cruise missiles". Twitter. Retrieved 24 January 2023.
  88. Yoshihiro Inaba (17 July 2021). "Video: Japan's Latest And Future Naval Defense Equipment". Naval News. Retrieved 7 October 2022.
  89. "National Defense Strategy of Japan" (PDF). Basis of Defense Policy. Japanese Ministry of Defense. December 16, 2022. p. 24. Retrieved 2023-01-19. In English.
  90. 1 2 "Defense Buildup Program (DBP)" (PDF). Basis of Defense Policy. Japanese Ministry of Defense. 16 December 2022. pp. 8, 20–21, 53 (Appendix Table 2), 55 (Appendix Table 5). Retrieved 2023-01-19. In English.
  91. 1 2 3 4 "Fiscal Year 2023 Defense Programs and Budget of Japan" (PDF). USNI News Blog. United States Naval Institute. March 30, 2023. p. 15. Retrieved 2023-03-31. English language version; hereafter as MOD FY23 Budget Overview.
  92. Brent Sadler (October 20, 2022). "Headline: Japan to build two 20000ton missile defense warships". LinkedIn. Retrieved 23 October 2022.
  93. "Air Defense: Aegis Ashore At Sea". StrategyPage. September 23, 2022. Retrieved 27 October 2022.
  94. Yoshitaka Ito (November 14, 2020). "Aegis Ashore alternative runs to at least 1.5 times the cost". The Asahi Shimbun. Retrieved 16 January 2023.

Bibliography

Secondary sources

Official sources

Japanese Ministry of Defense

United States sources

Periodicals

Japanese Ministry of Defense

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