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  6.  » U.S. Indefinitely Suspends Urgently Needed Tomahawk Missile Deliveries to Japan

Military Watch Magazine – May 24, 2026

The United States has indefinitely suspended the delivery of Japan’s first 400 RGM-109 Tomahawk cruise missiles, due to serious shortages of the missiles in the U.S. Navy that have resulted from the 39 day U.S. assault on Iran. The Financial Times, citing “several people familiar with the discussions”, reported that U.S. Secretary of War Pete Hegseth informed his Japanese counterpart, Shinjiro Koizumi, about the delay earlier in May. Commenting on the delay, Asia security expert at the American Enterprise Institute Zack Cooper observed: “Despite repeated promises from top administration officials that they would prioritise Asia, the Pentagon is now giving precedence to the Middle East… Given the lengthy timelines for munitions production, Asian allies and partners will continue to feel the impact of the Iran war long after it ends.”

The U.S. Navy was by the final week of March estimated to have expended close to 1,000 of Tomahawk cruise missiles, of a total arsenal of between 3,000 and 4,500 in its total inventory. Pentagon sources at the time raised serious concern regarding the rapid depletion of of the arsenal, with officials speaking to Washington Post stressing that the issue of depletion of scarce and high cost munitions types has been a matter of growing importance for the Department of War. Analysts have estimated that the U.S. launched attacks on more than 6,000 Iranian targets in the first 10 days of attacks alone, almost all using costly beyond visual range weaponry. The Tomahawk is the U.S. Navy’s primary weapon for medium and long range land attack roles, and is integrated onto destroyers, cruisers, and attack submarines. The missile in the late 2010s began to also be integrated onto ground-based launchers.

The Japanese destroyer JS Chokai in March became the first in the country’s history to complete crew training and ship modification to enable the employment of Tomahawk missiles. Although the U.S. and Australia have for decades integrated Tomahawks onto their AEGIS destroyers, with South Korea having integrated indigenous cruise missile types onto its own, Japanese doctrine has since the early Cold War years emphasised the use of destroyers for anti-submarine warfare and air and missile defence duties, rather than for land attack roles. This has rapidly changed from the late 2010s, however, as Japan has procured assets optimised for launching deep strikes into hostile territory. Japan’s transition towards fielding assets better optimised for offensive operations has fuelled considerable controversy domestically due to the country’s pacifist constitution, but has received considerable support in the Western world.

The U.S. Navy has in previous years procured Tomahawk missiles at rates of approximately 50 per year, with the low rate of production meaning that recovering stocks of thousands of depleted missiles could take several years even with projected increases in production and reductions to exports. The fallout from the war with Iran has seriously depleted stockpiles of multiple types of armaments, with types that were particularly exhausted including Precision Strike Missiles (PrSM), Patriot, THAAD, SM-3, and SM-6 air defence interceptors, and GBU-57 penetrative bombs, among others. Many of these were depleted to even greater extents than Tomahawk cruise missile stockpiles. Analysts have thus raised serious questions regarding the blunting of the U.S. Armed Forces’ ability to wage high intensity conflicts in future.

Japan is one of multiple clients for U.S. defence products that has seen equipment deliveries seriously delayed as a result of severe post-war shortages. Acting U.S. Secretary of the Navy Hung Cao on May 22 confirmed that the delivery of $14 billion worth of defence equipment to the Republic of China Armed Forces had been temporarily suspended, which is expected to exacerbate the already considerable delays to defence supplies. Outstanding backlogs of undelivered U.S. military equipment to the Republic of China Armed Forces had by December 2025 already reached over $21.45 billion. Japan had also faced serious issues with deliveries long before the war began, with the Japanese government Board of Audit having revealed in January that military equipment worth approximately 1.1 trillion yen ($6.9 billion) purchased from the U.S. under the Foreign Military Sales program more than five years ago had yet to be delivered.

Washington previously informed several of its European allies to expect delays in military equipment deliveries due to the severe depletion of during the conflict, while from late March multiple reports also indicated that the Department of War planned to redirect military equipment supplies originally designated to arm Ukraine for its war effort against Russia to instead support the war effort against Iran. Secretary Hegseth at the time emphasised that replenishing U.S. arsenals depleted during attacks on Iran took precedence over supplying Ukraine. The U.S. Armed Forces have also withdrawn stockpiles deployed in strategically key locations abroad, with a notable example being the withdrawal of THAAD and Patriot air defence systems from South Korea specifically for redeployment to the Middle East. This has fuelled calls in Seoul, including from President Lee Jae-myung, to limit reliance on the United States for the country’s security.

 

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