Malcolm Chalmers, deputy director-general of the Royal United Services Institute military think tank, told CBS News in March that about 20% of Ukraine's military hardware is supplied by the U.S., with 25% provided by Europe and the rest of the world, and 55% produced in Ukraine.

The Kremlin has repeatedly said arms shipments to Ukraine from allies prolong the conflict Moscow started and raise the risk of escalation. The U.S. confirmed this week it had paused supplying some arms to fight Russian aggression.

Those fears materialized in March 2025 when Trump imposed a week-long freeze on all American military aid and intelligence sharing with Ukraine. The flow soon resumed, but Trump's frustration has only deepened as U.S.-brokered peace talks floundered.