US rebuilding weapons stockpile could delay orders from allies

The U.S. has for years been the top weapons supplier in the world. Over the past five years, arms exports have gone to nearly 100 countries.

"These weapons are sought after around the world because we have the best weapons," said Under Secretary for Acquisition and Sustainment Michael Duffey.

The Trump administration says some of the U.S. stockpile depletion is because of the weapons given to Ukraine. The Center for Strategic and International Studies assesses those transfers have been a minor factor in the shrinking U.S. inventories except for one important tool – the Patriot Missile Defense System.

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"We've maxed out the production lines now, and that process began during the Ukraine War when it was clear that modern conflict was going to require a lot more munitions than we had been planning on," said Mark Cancian, a retired U.S. Marine colonel and senior advisor with the CSIS Defense and Security Department.

Between 2021 and 2025, Ukraine was the largest recipient of major arms around the world, with at least 36 countries supplying weapons. The U.S. was the top supplier over the five-year time period, accounting for 41% of Ukrainian arms imports.

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Before began in 2022, CSIS estimates the U.S. had around 2,200 Patriot missiles in its inventory. Estimates show around 600 missiles were given to Ukraine, with a few of those possibly coming from U.S. allies. Deliveries of new production outpaced the number given to Ukraine, with an estimated 2,300 missiles in the U.S. Patriot inventory before the Iran conflict began. Its estimated that around 36% of Patriot Interceptors remain from the pre-Iran war inventory.

"As chairman of the Foreign Affairs Committee, my job is to sign off on all foreign military weapons and sales to countries like Israel, to countries, like Taiwan and Ukraine, for that matter. And when we can't deliver on that promise because we can't make those weapons fast enough, it hurts our alliances, it hurts allies' ability to protect themselves," said Rep. Michael McCaul, R-Texas.

Publicly available government reports show at least four countries, including the U.S., have provided full Patriot missile systems to Ukraine. The U.S. is the only country that manufactures the Patriot battery, and one of two countries, along with Japan, to publicly show it produces Patriot missiles.

"If we take all of the Patriots for ourselves, and of course, that's 600 a year, we can refill the inventory much more quickly, but we have frozen out our allies and partners," Cancian said.

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Patriot producer Raytheon says, "Patriot is the foundation of integrated air and missile defense for 19 nations." But as the U.S. prioritizes rebuilding its weapons inventory, deliveries for some countries are already delayed.

"Unfortunately, the world we live in is an increasing threat, and that