This market resolves YES if, before January 1, 2026, any European country (excluding Russia and its military allies) deploys military personnel in combat roles inside Ukraine, meaning:

If uncertainty exists regarding a deployment’s combat status, the market will remain open until an official government statement or reliable investigative journalism clarifies the situation, published on more than two major news organizations, ideally across partisan lines, no further than March 2026.

If no such deployment occurs before January 1, 2026, the market resolves NO.