Wars have a way of draining arsenals built for a different theatre. The six-month U.S. war with Iran, launched in February 2026, consumed Patriot missile interceptors at a pace that defence planners are now reckoning with in a different part of the world entirely: Europe, where a war between Russia and Ukraine continues and where NATO's deterrence rests on many of the same weapons.
Anonymous U.S. defence and NATO officials told the Associated Press that Patriot interceptor stocks held by U.S. and allied forces in Europe have fallen to what they described as "beyond critical" levels. The primary cause, officials said, was the transfer of stockpiles to the Middle East to support operations against Iran.
A U.S. defence official based in Europe said American forces there "definitely" lack the interceptors needed to stop a sustained Russian ballistic missile attack. The official added that capability against even a single ballistic missile strike, or a stray Russian missile, would be "very limited."
The Patriot system, manufactured by Raytheon and Lockheed Martin, is the primary U.S. and allied surface-to-air defence against ballistic threats. Nineteen countries now operate it, including Germany, Poland, Japan, Saudi Arabia, and Ukraine, with each individual battery costing approximately $1 billion, according to the Guardian. NATO members operating the system in Europe include Germany, the Netherlands, Greece, Spain, Poland, and Sweden.
The scale of the depletion is significant. The Center for Strategic and International Studies (CSIS) estimates that approximately 65% of U.S. Patriot interceptors were expended during the Iran conflict. That translates to roughly 1,500 of a starting stock of 2,330, leaving fewer than 850 on hand, according to the CSIS figures. The United States currently produces approximately 600 interceptors per year. CSIS expert Mark Cancian has put the target for annual production at 2,000 by 2030, though whether that target will be met remains unclear.
U.S. forces in Europe are also facing critical shortages of ATACMS, the Army Tactical Missile System, a medium-range ballistic missile designed to strike targets behind enemy lines, according to the Los Angeles Times.
Both the Pentagon and NATO's senior military leadership disputed the shortage claims. U.S. Army Colonel Martin O'Donnell, NATO's senior military spokesperson, said the alliance has sufficient munitions for air defence and for continued assistance to Ukraine. Chief Pentagon spokesman Sean Parnell called reports of U.S. munition shortages "false," stating that the U.S. maintains a significant ready arsenal to protect its military personnel and interests.
The denials follow a pattern. Defence Secretary Pete Hegseth called shortage reports a "manufactured story" in June 2026. Two months earlier, however, he had acknowledged that replenishing missile stockpiles could take "months and years."
Ukraine sits at the sharpest end of the shortage. On one occasion, Ukrainian forces intercepted only one of 27 incoming Russian ballistic missiles because there were no interceptors available for their Patriot systems, NPR reported. On 25 August, President Volodymyr Zelenskyy announced receipt of a small batch of Patriot missiles, but said "more is needed." As of late August, no country had publicly pledged additional missiles to Ukraine.
Russia has been intensifying ballistic missile strikes against Ukraine as the global interceptor shortage deepens. Experts have described the situation as a "window of vulnerability" that Moscow is actively exploiting.
The core trade-off the Iran war has exposed is a structural one. Interceptors sent to the Gulf cannot simultaneously defend Europe, and production lines are running far below the pace of consumption. The classified figures for actual U.S. interceptor stocks in Europe are unknown, as are the precise inventories held by individual European NATO allies and the degree to which those could be pooled for collective defence. What the anonymous officials told the Associated Press is that the gap between what exists and what a sustained threat would require is now wider than at any recent point in NATO's history.
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