NATO countries neighboring Ukraine are being compelled to respond militarily in defense of alliance territory.

Poland scrambled fighter jets on Christmas morning after detecting a Russian reconnaissance aircraft near its airspace over ...

Tension shot up across Europe when a NATO nation was forced to scramble its fighter jets mere hours after a direct warning from Vladimir Putin about escalating conflict. With echoes of Cold War-style ...

NATO aircraft were scrambled in Romania and Poland overnight. LONDON -- NATO fighter jets were scrambled and ground-based air defense systems put on the highest level of alert in Poland and Romania ...

Japan and South Korea separately scrambled warplanes after Russian and Chinese jets conducted joint patrols in the skies near the two countries amid intensifying tensions in the region. Chinese and ...

Jets and air defense systems were involved in the response, Warsaw said. LONDON -- NATO fighter jets were scrambled and air defense systems put on alert in Poland in response to Russia's latest ...

Tensions rose on Christmas Day when Russian nuclear-capable bombers flew near British airspace, compelling NATO to scramble ...

South Korea lodged a “stern protest” Wednesday with representatives of Russia and China over flights by nine of their military aircraft into the South Korean Air Defense Identification Zone the ...