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.

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.

The move "was made to put America’s interests first," a White House spokeswoman said, as U.S. munitions have been depleted in recent years.