President Donald Trump injected some some uncertainty over whether the U.S. would abide by the mutual defense guarantees outlined in the NATO treaty as he headed to its summit.

A meeting between the leaders of Canada and the United States is not usually considered a high-stakes showdown.

Allies of the United States see a group chat about attack plans by top U.S. officials that accidentally included a journalist as a jaw-dropping security breach.

President Joe Biden's pledge to restore American credibility around the globe is at risk during the congressional debate over support for Ukraine.

President Joe Biden says the U.S. is enhancing its military presence in Europe for the long haul to bolster regional security after Russia’s invasion of Ukraine.

One year ago, Joe Biden strode into his first Group of Seven summit as president and confidently told the closest U_S_ allies that “America is Back.”.