US and Japan Strike Deal to Manufacture Advanced Air-to-Air Missiles in Japan

Key facts

Speaking to reporters late Wednesday following defense discussions in Cebu, Japan's defense minister confirmed that Tokyo and Washington had settled terms to construct a dedicated domestic manufacturing facility for advanced medium-range air-to-air missiles, according to reporting by the Associated Press. While bilateral discussions over co-development and co-production have circulated through working-level forums for over a year, the Cebu announcement represents a formal commitment to anchor the manufacture of front-line aerial interceptors on Japanese soil.

Under the arrangement, industrial contractors in Japan will work alongside American defense suppliers to assemble medium-range air interceptors, a class of munition that forms the backbone of air superiority doctrine for both the U.S. Air Force and the Japan Air Self-Defense Force. The missiles are standard equipment across multiple allied fighter fleets, including the fourth-generation F-15J and F-16 platforms as well as fifth-generation F-35 stealth fighters operated by both nations.

The discussions took place on the sidelines of broader defense gatherings in the Philippines, a location that itself underscores the expanding network of multilateral security arrangements spanning the First Island Chain. While Japanese defense officials did not publicly disclose the specific industrial site chosen for the assembly line or the initial capital expenditure allocated for construction, they affirmed that both governments have aligned on the strategic necessity of moving the joint manufacturing pipeline forward.

Why it matters

The agreement to manufacture medium-range air-to-air missiles in Japan carries far-reaching operational and industrial consequences for allied military posture in East Asia. Modern aerial combat hinges on beyond-visual-range missile capability; an adversary unable to match the range, radar guidance, and volume of an opponent's interceptor inventory faces crippling tactical disadvantages in any contested airspace. By establishing a licensed manufacturing hub across the Pacific, the alliance creates a resilient forward-deployed production base capable of sustaining flight wings without relying exclusively on maritime resupply convoys originating in North America during a high-intensity crisis.

For the United States, the pact provides relief to a severely backlogged domestic defense industrial base. Extended arms shipments to Ukraine, resupply initiatives in the Middle East, and growing procurement backlogs for foreign military sales partners have stretched American manufacturing lines to their limits. Solid-rocket motor supply bottlenecks, component shortages, and limited factory floor space have capped annual missile production rates below the levels defense planners estimate would be consumed during the opening weeks of a great-power conflict in the Western Pacific.

For Japan, the move solidifies Tokyo's transition from a strictly defensive equipment importer into an active co-producer of premier Western military systems. It integrates Japanese heavy engineering firms more deeply into the global defense supply chain, bolstering domestic aerospace engineering proficiency while ensuring that Japan's Self-Defense Forces have direct, localized access to essential munitions without facing protracted procurement queues governed by U.S. export licensing delays.

Since the end of World War II, Japan's defense acquisition policy was circumscribed by its pacifist constitution and stringent self-imposed bans on the export of arms and military hardware. Adopted in 1967 and tightened in 1976, the Three Principles on Arms Exports effectively barred Japanese industrial firms from selling weapons or co-developing defense materiel with foreign partners, with narrow exceptions carved out for ballistic missile defense cooperation with the United States beginning in the early 2000s.

That posture began to shift substantively in 2014 under then-Prime Minister Shinzo Abe, who replaced the blanket prohibition with the Three Principles on Transfer of Defense Equipment and Technology. In December 2022, Tokyo accelerated this realignment by releasing a landmark National Security Strategy that committed Japan to doubling its defense outlays to roughly two percent of gross domestic product by 2027 and acquiring counterstrike capabilities. Further revisions in late 2023 allowed Japan to export finished defense goods—including licensed Patriot surface-to-air missile interceptors—back to licensing nations such as the United States.

In April 2024, during a state visit by Japanese leadership to Washington, both countries formally announced the creation of the Defense Industrial Cooperation, Acquisition and Sustainment (DICAS) forum. Led by the Pentagon's acquisition office and Japan's Acquisition, Technology and Logistics Agency (ATLA), DICAS was specifically charged with identifying weapon systems suitable for joint production, prioritizing air-to-air missiles, naval ship maintenance, and aircraft engine sustainment. The Cebu announcement marks the operational fruition of those administrative mechanisms.

Concurrently, security conditions in East Asia have grown increasingly volatile. Beijing has expanded maritime patrols around the Japanese-administered Senkaku Islands, which China claims as Diaoyu, and intensified naval and air exercises encircling Taiwan. China's rapid commissioning of advanced fourth-and-fifth-generation fighters, such as the J-16 and J-20 equipped with PL-15 long-range missiles, has placed mounting pressure on allied air wings to maintain parity in missile capability and inventory depth.

Reaction

While formal diplomatic communiqués from neighboring capitals had not been delivered at the time the Cebu remarks were made, the announcement is expected to draw sharp pushback from Beijing. Chinese foreign and defense ministry spokespersons have routinely condemned U.S.-Japan security integration as an attempt to construct an "Asian NATO" designed to encircle and contain China, historically lodging formal diplomatic protests whenever Tokyo loosens its arms transfer constraints or deepens military-industrial cooperation with Washington.

Domestically, the decision aligns with broad political consensus inside Japan's ruling coalition, which has prioritized military modernization and industrial resilience. However, opposition lawmakers and civil society organizations in Japan have historically scrutinized any expansion of licensed military manufacturing, raising concerns over transparency, the potential for secondary transfers to third countries engaged in active conflicts, and constitutional fidelity under Article 9.

In Washington, defense committees across Capitol Hill are broadly supportive of allied co-production initiatives. Lawmakers from both parties have persistently pressed the Department of Defense to expand co-assembly arrangements with treaty allies—including Australia under the AUKUS banner and South Korea—to diversify the defense industrial base and reduce single-point-of-failure vulnerabilities inherent in domestic manufacturing facilities.

What we don't know yet

Several operational and technical parameters remain unclarified following the initial remarks in Cebu. The Japanese defense chief did not specify which domestic aerospace firm will oversee the facility, though defense contractors such as Mitsubishi Heavy Industries have historically served as the primary licensed producers for American-designed aerospace systems in Japan.

Additionally, the exact timeline for groundbreaking, initial low-rate production, and full operational capability has not been published. Establishing an advanced missile production line requires stringent facility certification, cleanrooms, explosive-handling licensing, and secure supply chains for restricted microelectronics and rocket propellants. It remains unclear what proportion of the missile components will be fabricated domestically inside Japan versus imported as assembly kits from U.S. prime contractors such as RTX Corporation. Finally, whether missiles rolling off the Japanese line will be reserved exclusively for the Japan Air Self-Defense Force or integrated directly into U.S. regional stockpiles remains to be detailed.

What to watch

The trajectory of the project will depend on several upcoming administrative and diplomatic milestones. Observers will be tracking formal budget requests from Japan's Ministry of Defense in its next fiscal cycle, which will detail line-item spending for facility construction, tooling acquisition, and technology-transfer royalties. In Washington, the Department of State and the Defense Security Cooperation Agency must navigate formal regulatory clearances, including International Traffic in Arms Regulations (ITAR) waivers and Congressional notifications required for licensed overseas production of critical munitions.

Attention will also center on subsequent DICAS ministerial sessions, where working groups are expected to finalize licensing agreements and define supply-chain governance. Observers will monitor any reciprocal industrial commitments, including whether Japan secures long-term maintenance contracts for forward-deployed American naval vessels or collaborative research on next-generation composite rocket motors. Finally, regional response indicators, including formal statements from China's Ministry of National Defense and potential adjustments to Chinese aerial posture around the Ryukyu island chain, will signal the geopolitical friction generated by the initiative.

This account is based on reporting by the Associated Press.