NATO's surprising move after Ukraine attack stuns Europe and the shocking decision will completely change everything you thought you knew.

NATO jets were launched into the skies as a massive Russian missile and drone assault pummeled Ukraine. In the chaos, a Ukrainian F-16 supersonic fighter, provided by Western allies, was downed, resulting in the death of a "hero" pilot during an intense effort to intercept over 500 attacks by Vladimir Putin's forces.

A soldier who defected from Russia's notorious mercenary army has slammed military leaders who left troops to "rot in the fields". The Wagner soldier, named as Yevgeny, has reportedly defected to Finland after fighting as part of Russia 's new assault forces in Ukraine.

Elements of the response force assisted in NATO’s withdrawal from Afghanistan last summer and could now be deployed for a similar humanitarian mission to help Ukraine’s NATO neighbors prepare ...

Experts say a variety of circumstances at play in Russia’s invasion of Ukraine could lead NATO members to invoke the ‘collective defense’ principle at the heart of their treaty.

For the first time, the NATO Response Force has been activated as a defensive measure in response to Russia’s ongoing invasion of Ukraine. NATO Supreme Allied Commander Gen. Tod Wolters ...

But as Russian troops advanced in their invasion of Ukraine overnight, NATO announced on Feb. 25 that, for the first time in history, it would deploy parts of its combat-ready response force to ...

US, NATO 'would respond' if Putin used chemical weapons in Ukraine, Biden says "The nature of the response would depend on the nature of the use," he said.

If Poland were invaded today, would NATO’s response look different from past conflicts or would Article 5 be triggered immediately with overwhelming force? This analysis explores NATO's current posture,