Japan’s missile leap marks shift from defense to counterstrike
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- Japan's Maritime Self-Defense Force launched a Tomahawk land-attack cruise missile from the Kongo-class destroyer JS Chokai in late July with US Navy support, making Japan the third foreign country to fire the weapon from a surface warship.
- The Japan Air Self-Defense Force began flight testing an F-2 fighter equipped with the air-launched Upgraded Type-12 Surface-to-Ship Missile at Gifu Air Base, part of a broader push toward standoff weapons with planned ranges of up to 1,600 kilometers.
- Japan is procuring 400 US Tomahawks as an interim capability while developing indigenous standoff missiles for deployment by fiscal year 2027, even though a Hudson Institute report cites lead times of up to 47 months for the missile.
- A December 2025 International Crisis Group report finds Japan lacks an independent kill chain and remains dependent on US ISR, planning, and targeting — a gap a 2026 Helms School paper says leaves the new missiles vulnerable to Chinese disruption and alliance friction.
- Defense Minister Shinjiro Koizumi said Japan is "thinking about nuclear weapons," and PM Sanae Takaichi declared Taiwan a threat to Japanese sovereignty — moves the source says make a Chinese adjustment to its nuclear doctrine likely.
- Opposition parties and Komeito dispute the constitutional threshold for strikes on enemy territory, with analysts warning that ambiguous criteria could hollow out Japan's exclusively defense-oriented policy and entangle Tokyo in US-led operations.
- An April 2026 CSIS report argues US-Japan alignment is strained by divergent priorities and command structures that still lack clarity over delegated authority, real-time decision-making, and coordination with US Indo-Pacific Command.
Why it matters: Japan is acquiring 400 Tomahawks and 1,600-km-range standoff missiles ahead of the doctrine, kill chain, and 47-month munitions lead times needed to employ them credibly. Koizumi's nuclear remarks and Takaichi's Taiwan comments signal a doctrinal shift that the source says will likely draw a Chinese nuclear-doctrine response, raising the stakes around a posture neither side has yet aligned the operational plumbing to support.
