Japan’s successful Tomahawk and Upgraded Type-12 tests mark a decisive shift beyond interception-only defense toward a more assertive counterstrike posture.
Last month, multiple media outlets reported that Japan’s Defense Ministry significantly expanded its long-range strike capabilities by conducting two milestone tests of standoff missile systems aimed at strengthening deterrence in the Indo-Pacific.
In late July, the Japan Maritime Self-Defense Force, supported by the US Navy, launched a Tomahawk land-attack cruise missile from the Kongo-class Aegis destroyer JS Chokai in the Pacific, making Japan the third foreign country to launch the weapon from a surface warship.
At Gifu Air Base, the Japan Air Self-Defense Force (JASDF) also began flight testing an F-2 fighter equipped with the air-launched Upgraded Type-12 Surface-to-Ship Missile. The test supports Japan’s broader effort to field low-observable, networked standoff weapons, including systems designed to strike targets at ranges of up to 1,600 kilometers.
Japan is procuring 400 US Tomahawk missiles as an interim capability while developing indigenous standoff missiles for deployment by fiscal year 2027, seeking to deter China without formally abandoning its exclusively defense-oriented posture.
Japan’s defense-only posture is a well-worn myth and known to China. With Japan developing a first-strike capability and now “thinking about nuclear weapons,” as announced by Defense Minister Shinjiro Koizumi, China is now likely to adjust its nuclear doctrine accordingly.
Combined with Prime Minister Sanae Takaichi’s remarks that Taiwan poses a threat to Japanese sovereignty, the danger of Japan-China strategic instability and possible future nuclear confrontation is rising.
At the same time, Japan’s rapidly expanding missile reach is running ahead of the targeting networks, stockpiles, alliance arrangements and legal doctrine needed to employ those weapons credibly.
In a March 2026 International Institute for Strategic Studies (IISS) report, Rupert Schulenburg places new standoff weapons within a broader strike architecture, arguing that ship-launched Tomahawks would give Japan a naval capability for deep precision strikes.
He adds that the Upgraded Type-12 missile, with a reported range of at least 900 kilometers, will substantially expand the Japan Self-Defense Forces’ (JSDF) maritime-strike reach compared to existing systems like the ground force’s 200-kilometer Type-12 and the air force’s 180-kilometer ASM-2.
Operationally, Japan still lacks an independent kill chain capable of finding and tracking targets, launching strikes and assessing damage, according to a December 2025 International Crisis Group (ICG) report. It remains dependent on US capabilities across those functions.
That dependence also leaves Japan’s counterstrike force vulnerable to alliance friction and Chinese disruption, Kaitlyn Early and Carl Rehberg argue in a 2026 Helms School of Government conference paper.
They argue that Japanese missiles become credible only when the US synchronizes intelligence, surveillance, and reconnaissance (ISR), planning and targeting within a unified denial posture; otherwise, they appear fragmented and exert less influence on China.
Mixed US signaling, force-posture gaps and incomplete integration further weaken that credibility, particularly in a Taiwan contingency where compressed timelines would leave little room for delayed intelligence, political hesitation or disrupted command networks.
The logistics picture is equally problematic. Masashi Murano and William Chou argue in a June 2026 Hudson Institute report that Japan’s munitions industry lacks scale, relies on fragile supply chains and remains dependent on foreign components and allocation decisions.
Tomahawk deliveries are particularly exposed: US production increases will take years, while active wars and global demand intensify competition for scarce munitions. Murano and Chou cite lead times of up to 47 months for the missile.
Japan has also prioritized expensive platforms — including F-35 fighters, upgraded F-15s and Aegis-equipped vessels — over sufficient stocks of missiles and interceptors, leaving its inventories and industrial capacity ill-prepared for sustained, high-intensity combat.
The doctrinal problem is how to strengthen deterrence without destabilizing the alliance arrangements that have long governed Japan’s use of force.
Satoru Mori and Shinichi Kitaoka argue in a 2022 RAND report that China’s growing missile capacity and saturation tactics make relying solely on ballistic missile interception inadequate for Japan’s defense.
They propose adding a limited counterstrike capability — conducted as a proportional, retaliatory measure after being attacked first — targeting fixed coastal military infrastructure such as air bases, naval ports, logistics hubs, radar sites and command headquarters.
In the same report, Jeffrey Hornung analyzes the operational implications for the alliance, noting that the allies are “woefully behind the curve” on bilateral planning.
He stresses that integrating long-range fires will require deep synchronization across joint targeting, command-and-control structures, C4ISR hardware dependencies, and active/passive force protection for Japanese launch sites.
Those coordination problems persist. In an April 2026 Center for Strategic and International Studies (CSIS) report, Kristi Govella and Nicholas Szechenyi argue that US-Japan alignment is being strained by divergent priorities and incomplete mechanisms for employing Japan’s new capabilities.
The US emphasizes allied burden sharing while dividing its attention among the Indo-Pacific, Western Hemisphere and Middle East; Japan remains focused on China, North Korea and preserving the regional order.
New command structures still lack clarity over delegated authority, frontline decision-making and coordination with US Indo-Pacific Command. The allies have also yet to settle arrangements for intelligence sharing, targeting, real-time decisions and the operational division of labor surrounding Japanese strikes.
Legal limits on Japanese force employment, doubts about extended deterrence, intelligence-sharing weaknesses and unresolved alliance roles could therefore leave the new missiles operationally disconnected despite otherwise smooth cooperation at lower levels.
The domestic debate has meanwhile shifted from whether Japan should possess long-range missiles to when their use would remain defensive rather than become pre-emptive, Charlotte Boring and Wrenn Yennie Lindgren wrote in Japanese Studies in December 2025.
According to Boring and Lindgren, the government maintains that strikes on enemy territory can remain constitutional when they are limited to the minimum force necessary for self-defense and conducted within Japan’s established legal conditions for responding to an armed attack.
However, Boring and Lindgren say opposition parties and Komeito dispute where that threshold lies: must an attack first strike Japan or an ally, or could an adversary’s launch preparations justify action?
They warn that ambiguous criteria could enable first strikes, hollow out the limits of Japan’s exclusively defense-oriented policy and entangle the country in US-led operations.
Japan’s next test will be whether it can convert missile acquisitions into rules, stockpiles and alliance mechanisms robust enough to function under crisis pressure without eroding the defensive legitimacy on which the policy’s political sustainability depends.
