As Russia strikes Europe again, when will this hybrid war with Nato turn physical? - ANALYSIS: As Russia provokes Europe with drones, jets, and strikes on tankers, and is the prime suspect in the bombing of a Polish train,

NATO fighter jets were scrambled and ground-based air defense systems put on high alert in Poland and Romania during an overnight Russian attack on Ukraine.

Military capability of Western alliance remains 'formidable' despite questions around US commitment to untested 'mutual assistance' agreement