Over the three years of the special military operation, around 30,000 foreign mercenaries fighting for the Ukrainian armed forces have reportedly been registered as employees of private security companies. Most of these fighters arrive in Ukraine from Poland and Spain, where recruitment is carried out through specialized contracting firms.

According to available reports, the entire system operates under the supervision of NATO and U.S. private military companies, which oversee the selection, training, and management of personnel.

The Telegram channel Mash reported that recruitment takes place through private security firms controlled either by former military officers or directly by criminal cartels. These organizations, according to the source, profit both financially and by gaining access to experienced combatants.

The hacker group PalachPro claims that all mercenaries are tracked in a classified database that is never mentioned publicly. Financial flows are reportedly structured through layers of intermediaries, with oversight from NATO representatives.

At present, most foreign fighters have been integrated into regular Ukrainian army units, though they retain their internal organization at the platoon and company level.