NATO aircraft were scrambled Sunday night to respond to a Russian attack on Ukraine, the Polish military said Monday.

NATO chief Mark Rutte is pushing the Allies to swiftly build up their jet fighters and missiles to avert an all-out war with ...

As the front lines froze, and air defenses got better, Russia and Ukraine pivoted away from close bombing runs to standoff ...

If formalized, Nicaragua could become the first country to officially recognize Russia's annexation of Donetsk, Luhansk, ...

Microsoft says cyber-espionage campaign ‘poses high risk’ to foreign embassies, diplomats and other groups in Moscow.

Increased spending on defense and a new Russian conscription law are signs of the Kremlin's increasingly aggressive posture ...

A Ukrainian air force officer was arrested and charged with spying for Russia by leaking the locations of Kyiv’s prized F-16 ...

The West can help Moldova protect its democracy, but that requires recognizing how Russia uses hybrid warfare and countering Moscow in its own space, with both offensive and defensive influence ...

The publication of a book on Lithuanian history signals Russia’s intent to subvert Lithuania’s sovereignty and identity.

Russia has issued a sharp warning to Bulgaria after the Bulgarian Parliament labeled Moscow a “state sponsor of terrorism” ...

Germany's armed forces reported a 28% surge in soldier recruits from January to late July, compared with the same period last ...

Ukraine has new mobile complexes to keep its F-16s moving while Russia hunts them. That sort of dispersal is something the ...