(June 3, 2023)

Three of the Mine-Resistant Ambush Protected vehicles, also known as MRAPs, taken into Russia by the fighters were provided by the United States and the fourth was from Poland, according to people familiar with the U.S. intelligence finding, which has not previously been reported.
(…)
The fighters also carried rifles made by Belgium and the Czech Republic and at least one AT-4 antitank weapon in common use among U.S. and Western troops, according to photos verified by The Washington Post.