North Atlantic Treaty Organization - NATO

Blinken said the U.S. response, delivered by U.S. Ambassador to Russia John Sullivan, gave up no ground on "core principles."

"The Sept. 11, 2001, attacks brought changes in the United States' military position as it shifted focus to Central Asia and...

Russia has denied it is planning an assault, but it has massed an estimated 100,000 troops near Ukraine in recent weeks.

Russia has massed an estimated 100,000 troops near Ukraine’s border.

As a show of alliance unity, the Truman strike group will sail under NATO control as the centerpiece of Neptune Strike '22.

The Biden administration is unlikely to answer a further Russian invasion of Ukraine by sending U.S. combat troops.

Amid the tensions, Ukraine sustained a massive cyberattack Friday, which hit websites of multiple government agencies.

Senior NATO and Russian officials were meeting to try to bridge seemingly irreconcilable differences over the future of...

NATO appears to have rejected a key part of President Vladimir Putin's demands for easing tensions with Ukraine.

President Biden has warned Russian President Vladimir Putin that Washington could impose new sanctions against Moscow.