Japan acquires Tomahawk and Type 12 and prepares GCAP to equip itself with a counterstrike capability without abandoning its defensive framework.
In summary
Japan is undergoing one of the most significant military transformations since the creation of the Self-Defense Forces in 1954. On July 29, 2026, the destroyer JS Chōkai conducted Japan’s first live-fire test of a Tomahawk missile, following the entry into service of the upgraded Type 12 in 2025. Tokyo is thus building a long-range counterstrike capability that allows it, under certain conditions, to strike an adversary’s territory in order to prevent further attacks against Japan. At the same time, Mitsubishi Heavy Industries plays the central Japanese industrial role in the Global Combat Air Programme led with the United Kingdom and Italy, which is expected to produce a next-generation fighter by 2035. But possessing missiles with a range of 1,600 kilometers is not enough. Targets must be detected, identified, and tracked. Japan remains heavily dependent on the U.S. alliance for certain ISR functions, while now building its own satellite constellation to reduce this vulnerability.
The Tomahawk firing materializes a Japanese strategic shift
The symbolism is hard to exaggerate.
On July 29, 2026, the Japan Maritime Self-Defense Force guided-missile destroyer JS Chōkai launched a Tomahawk during a live test in the Pacific, supported by the United States Navy. The vessel had completed its modifications and crew training in the United States on March 27. The test validated both the ship’s technical capability and the Japanese sailors’ mastery of the weapon.
Until recently, such a scene would have been politically difficult to imagine.
The Tomahawk is not a missile designed primarily to defend a ship. It is a long-range land-attack weapon. In its Block IV and Block V variants, the United States Navy credits it with a range of approximately 1,600 kilometers, or 900 nautical miles. It flies at subsonic speed and extremely low altitude. Its navigation system combines inertial navigation, GPS, TERCOM, and digital scene matching, among other technologies.
Such a range radically alters the military space accessible to Japan.
From a destroyer operating in Japanese waters or the Western Pacific, a Tomahawk can theoretically reach targets far removed from the Japanese coastline. The question is therefore no longer just about intercepting an enemy missile after its launch. It becomes one of the capacity to neutralize the means used to continue the attack.
This is precisely the logic behind the counterstrike capability adopted by Tokyo.
The Type 12 gives Japan a second long-range strike family
Yet the Tomahawk is merely a transitional and complementary solution.
The most important long-term program remains Japanese: the Upgraded Type-12 Surface-to-Ship Missile.
The Ministry of Defense confirmed that a second launch test of the upgraded ground-based version was conducted between October and November 2025. Its development and deployment were completed during fiscal year 2025, faster than originally scheduled.
The exact range of this version remains classified in publicly available official Japanese documents. The numerous estimates circulating regarding a range of around 1,000 kilometers or more should therefore be treated as estimates, not as officially published specifications.
The evolution is nonetheless major.
The original Type 12 was primarily a land-based anti-ship missile. The upgraded version is becoming a family of weapons that can be launched from the ground, ships, and, eventually, aircraft. Japan’s fiscal year 2026 budget allocates 177 billion yen for the acquisition of the ground-based version and its equipment, as well as 35.7 billion yen for the naval version. Nine F-2 fighters are also slated for modification to prepare for the integration of the air-launched variant.
This diversification follows a simple military logic.
An adversary can monitor and attempt to neutralize a few large missile bases. It is much harder to simultaneously track mobile ground launchers, destroyers, submarines, and aircraft capable of carrying different stand-off weapons.
Tokyo is therefore seeking to create multiple parallel strike chains.
Japanese counterstrike does not mean a preemptive strike doctrine
The strategic shift in Japan nevertheless warrants an essential legal clarification.
Japan is not declaring an abandonment of its exclusively defense-oriented doctrine. On the contrary, it maintains that its new counterstrike capability remains compatible with it.
The December 2022 National Defense Strategy establishes a very strict distinction.
A counterstrike can be launched when Japan has suffered an armed attack and when missiles or other means are being employed against it. The strike against adversary territory must then constitute the bare minimum necessary for self-defense and respect the legal conditions governing the use of force.
A preemptive strike remains explicitly prohibited.
The nuance is fundamental.
Tokyo does not officially claim the right to destroy a North Korean battery simply because it believes it might fire in a few days. The logic is that of interrupting an attack that has already been launched: intercept incoming missiles, then strike enemy assets to prevent further salvos.
This interpretation was not invented in 2022. As far back as 1956, the Japanese government noted that striking a missile base could legally fall under self-defense when no other means existed to protect the country.
What has changed is therefore not merely the constitutional interpretation.
For decades, Japanese governments made the political choice not to acquire the necessary means.
That restraint is disappearing.
Targeting now constitutes the real military challenge
Buying a missile with a range of 1,600 kilometers does not automatically create a 1,600-kilometer strike capability.
One must still know precisely what to strike.
For a fixed target known well in advance, such as a permanent military facility, the problem is relatively simple. Coordinates can be obtained and verified long before the mission.
For a mobile target, everything changes.
A vessel traveling at 30 knots—roughly 56 km/h—can cover nearly 28 kilometers in thirty minutes. A mobile land launcher can leave its position immediately after firing. A battery can hide in a tunnel, under a hangar, or in a forested area before reappearing elsewhere.
The military chain must therefore detect the target, identify it, determine its coordinates, maintain track, transmit this data to command, select an effector, and potentially update information during engagement preparation.
This is the kill chain, or targeting chain.
And it is currently the most difficult part of Japan’s transformation.
U.S. dependence remains strong, but it is no longer absolute
Depicting Japan as completely dependent on U.S. satellites would, however, be inaccurate.
Tokyo already possesses its own radars, intelligence capabilities, surveillance aircraft, government satellites, and access to commercial data. The Defense Intelligence Headquarters is also developing the SIGINT, IMINT, GEOINT, and OSINT capabilities necessary to analyze the military environment.
However, for an autonomous, deep, persistent strike capability capable of tracking mobile targets across a vast theater, the Japanese network remains incomplete.
The alliance with Washington therefore remains essential.
Japanese missile defense architectures notably rely on information provided by U.S. space-based early warning capabilities. Tokyo and Washington also plan to coordinate their detection, command, and counterstrike assets.
The National Defense Strategy is explicit: even after acquiring new Japanese capabilities, both countries must cooperate for counterstrike operations just as they already cooperate in ballistic missile defense.
This dependence raises a delicate operational question.
A sovereign missile offers only limited sovereignty if the coordinates required for its employment depend on another state.
Japan has identified this problem perfectly.
Japan’s satellite constellation aims to close the missing link
Tokyo is therefore investing directly in the autonomous collection of targeting data.
Japan’s Space Domain Defense Guidelines envision a constellation of satellites designed to provide persistent detection and tracking of targets necessary for the employment of stand-off weapons. In particular, the system will need to track mobile targets and enable the rapid processing of massive amounts of data. Japan is also studying optical inter-satellite communications and target identification using onboard artificial intelligence.
The project was planned to begin taking shape starting from the end of fiscal year 2025.
This constellation is arguably as important as the missiles themselves.
The Japanese Ministry of Defense implicitly acknowledges this in its 2026 budget: stand-off capabilities do not consist solely of Tomahawk, Type 12, JASSM, or JSM. They also include drones, satellites, targeting intelligence gathering, and command systems. For this stand-off defense pillar alone, Tokyo is projecting approximately 973.3 billion yen in fiscal year 2026.
A missile without intelligence is a theoretical weapon.
Conversely, a constellation capable of continuously tracking ships or mobile units turns long range into a genuine operational capability.
GCAP prepares the second shift in Japanese air power
Japan is simultaneously working on another transformation: its future combat aircraft.
The Global Combat Air Programme brings together Japan, the United Kingdom, and Italy around an aircraft intended to enter service in 2035. It will notably replace the Japan Air Self-Defense Force’s Mitsubishi F-2s.
The program should not be understood as merely the development of yet another stealth fighter.
It aims for a combat architecture combining a manned aircraft, distributed sensors, ultra-high-speed communications, electronic warfare, advanced weapon systems, and likely cooperation with uncrewed platforms.
The industrial structure reflects this ambition.
Edgewing was created in June 2025 by BAE Systems, Leonardo, and Japan Aircraft Industrial Enhancement Co., with each holding a 33.3% stake. Edgewing serves as the program’s design authority, while manufacturing and final assembly are to be subcontracted to BAE Systems, Leonardo, and Mitsubishi Heavy Industries within their respective national industrial bases.
Japanese reports published in late July 2026 designate Mitsubishi Heavy Industries’ Komaki South plant in Aichi Prefecture as the future Japanese center for the program. This choice is industrially logical: Komaki is already a major hub for Japanese military aviation. However, primary official documents consulted confirm MHI at this stage as the Japanese entity responsible for manufacturing and final assembly, without constituting on their own a formal government notification of the specific selection of Komaki South.
This distinction is important when covering a program that is still being established.
GCAP also addresses a question of industrial sovereignty
For Tokyo, participation in GCAP carries a different dimension than purchasing the F-35.
Japan operates and assembles a portion of its F-35As, but the aircraft remains an American design whose core technologies are controlled by the United States.
With GCAP, Tokyo wants to preserve a sovereign capability to design, manufacture, integrate, and modify a top-tier fighter.
The Ministry of Defense itself explains that relying entirely on another country to ensure air superiority would reduce Japan’s operational freedom. Maintaining a domestic fighter production base is therefore considered a component of national security.
Mitsubishi Heavy Industries sits at the heart of this policy.
The company has extensive experience producing F-15Js, developing the F-2, and performing Japanese assembly of the F-35A. GCAP is now intended to allow this industrial base to reach a new technological tier.
The Japanese paradox is clear: Tokyo is simultaneously strengthening its alliance with Washington while seeking to reduce certain American technological dependencies.
It is not a choice between autonomy and alliance. It is about gaining greater autonomy within the alliance.
Political constraints will remain as significant as missile performance
The main obstacle is ultimately not technical.
Japan possesses the industrial resources to manufacture advanced missiles and participate in the development of a next-generation fighter. Its military budget is rising sharply. Its space network is advancing.
However, any counterstrike capability directly impacts the political balance built since 1945.
Article 9 of the Japanese Constitution remains at the heart of the debate over the use of force. The government maintains that these new capabilities remain compatible with an exclusively defense-oriented security posture. Its critics fear that a continuous increase in range, intelligence assets, and strike capabilities will gradually blur the boundary between defense and offensive power.
The difficulty becomes even greater when determining the precise moment a counterstrike is legally authorized.
Has a missile salvo just been fired? Is a second one truly in preparation? Does the identified launcher belong to the same attack chain? Does the target still constitute an active threat?
These questions are not theoretical.
A Tomahawk can travel more than a thousand kilometers. The political and military decision authorizing its launch must therefore be made based on intelligence reliable enough to justify a strike on another state’s territory.
Legal precision thus becomes almost as crucial as missile accuracy.
Japan is now building the complete kill-chain of military power
Japan’s true shift lies neither in the Tomahawk, nor in the Type 12, nor even in GCAP taken separately.
It lies in their combination.
Tokyo is progressively constructing the various elements required to detect a threat, share information, decide on a response, and strike at long range from land, sea, or air.
The Tomahawk immediately provides a range of around 1,600 kilometers. The upgraded Type 12 is expected to offer a multi-platform domestic capability. Satellites are intended to create the detection autonomy required for these weapons. New command networks are meant to shorten the decision cycle. GCAP is expected, after 2035, to add a new aerial node capable of operating at the core of this architecture.
This is far deeper than mere rearmament.
Japan is not officially abandoning its defense principle. It is changing what defending itself actually means.
For decades, protecting Japanese territory primarily meant detecting an attack and stopping it over the sea or national territory. The new doctrine considers that credible defense may require striking the source of an attack hundreds or thousands of kilometers away.
The transformation does, however, contain a clear weakness: weapons are currently advancing faster than Japanese targeting autonomy.
It is therefore less the next test of the Type 12 than the development of satellites, data networks, and joint command that will bear watching. When Tokyo can detect, track, and engage a mobile target at extreme range largely autonomously, Japan will not simply have acquired new missiles.
It will have completed its transition into a true stand-off strike power.
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