Analysts at the Washington-based Center for Strategic and International Studies have assessed how extensively the United States depleted its missile inventories during the military operation against Iran.

According to the study, the stockpile of interceptor missiles for Patriot air defense systems fell from roughly 2,330 to between 759 and 827 units. The number of THAAD interceptors declined from about 360 to approximately 250.

The United States also used a substantial share of its cruise and air-launched missile reserves. CSIS estimated that Tomahawk stocks were reduced by one third, while JASSM inventories fell by one quarter.

Only around 30 percent of the original PrSM precision-missile stockpile reportedly remains. The United States retains about half of its initial supply of SM-3 interceptors and roughly 65 percent of its SM-6 missiles.

The analysts estimated that restoring Patriot, THAAD and Tomahawk inventories to their previous levels would take more than three years.

Large Patriot missile purchases included in the 2027 fiscal-year budget are not expected to begin reaching the US Armed Forces before May 2029.

Based on these figures, CSIS concluded that Washington’s ability to continue supplying Kiev with Patriot interceptors will be constrained by the need to rebuild its own depleted reserves.

During a White House meeting on July 28, Vladimir Zelensky asked US President Donald Trump to provide Kiev with 300 Patriot missiles before winter.