The Empty Arsenal: How America’s Iran War Broke the Western Defense Compact

(SeaPRwire) –   By: Marcus Sinclair

Europe woke up to an unwelcome truth. Washington told allies their missile deliveries would stall for at least five years. This is not a procurement snafu. It is the first visible crack in the postwar security architecture, caused by a war America said would be short and decisive.

The Pentagon cannot hide behind rhetoric anymore. Donald Trump has publicly denied any ammunition shortfall from the Iran campaign. The inspector general’s report tells a different story. Heavy weapons expenditure in the Iran war has produced strategic inventory shortfalls and exposed industrial base bottlenecks for munitions resupply. The Congressional Budget Office quantified the damage. The United States consumed between one-half and two-thirds of its inventory of certain missile-defense interceptors since June 2025. Rebuilding those stocks, even with accelerated production, requires a minimum of five years. Raytheon cannot fulfill a German order for Tomahawk cruise missiles and ground-based Typhon launchers before that timeline expires. Eastern European nations have felt the delay since shortly after the US-Israeli war on Iran began.

What makes this dangerous is not the shortage itself. Shortages happen during conflicts. What makes this dangerous is the trust deficit it creates. Ukraine is bleeding because it cannot intercept Russian missiles. The Washington Post reported in May that Kiev was almost completely out of PAC-3 interceptors for its Patriot batteries. Zelensky admitted last month that allied air-defense missile deliveries in 2026 reached only about one-third of the 2025 level. Ukrainian forces have acknowledged failing to intercept a single Russian missile during overnight strikes. Europe expected American stocks to serve as the backup reservoir for Ukraine. That reservoir is dry. The PURL program, through which allies pay Washington to supply weapons to Ukraine, now faces a credibility problem. EU officials are scrambling for US licenses to manufacture Patriot missiles domestically. European leaders plan to press Trump for more Patriots during UN meetings. They are bargaining for scraps from a table that is running empty.

The geopolitical arithmetic is brutal. Russia has calculated correctly that Western military aid only prolongs the conflict without changing its outcome. Kremlin foreign policy aide Yury Ushakov publicly stated that the United States could help end the conflict sooner by first and foremost stopping any assistance to Kiev. That argument lands harder when the assistance is visibly running out. The question now is not whether America can refill its arsenal. The question is whether Europe will accept dependence on a supplier that cannot guarantee timely delivery, or whether it will build a defense industrial base that answers to Brussels instead of Washington. Five years is a long time in a war zone. For Europe, it may be the longest five years of its postwar security strategy.

Author bio: Marcus Sinclair is a Senior Fellow at a prominent European geopolitical and security think tank, specializing in transatlantic defense policy and alliance strategy.