The U.S. move affects high-demand munitions, including Patriot missiles, the AIM-7 Sparrow air-to-air missile and shorter-range Stinger missiles.

Ukrainian authorities are enlisting European help to increase domestic military production as the United States pauses some weapons shipments to Ukraine

Calls are mounting for the Europeans to use Russian assets that they froze after the full-scale invasion in 2022 to help Ukraine. At the end of March, around $320 billion worth — the bulk of the assets — was being held by Belgian clearing house Euroclear.