Russia's hybrid warfare rattles Poland and NATO

Investigators examine a rail line damaged in an explosion in Mika, next to Garwolin, central Poland, on Nov. 17, 2025. Polish Prime Minister Donald Tusk said the explosion that damaged a railway line to its close ally Ukraine was an "act of sabotage."

Russia is stepping up covert attacks across Europe — rail sabotage, drones, cyber strikes — testing NATO. Polish officials warn "disposable agents" are sowing fear and weaken support for Ukraine.

(Image credit: Wojtek Radwanski)