Russian President Vladimir Putin’s war in Ukraine and his push to upend the broader security order in Europe may lead to a historic shift in American thinking about defense of the continent. Depending on how far Putin goes, this could mean a buildup of U.S. military power in Europe not …

Ukraine said it saw possible room for compromise in talks with Russia despite Moscow’s stepped up bombardment Tuesday of Kyiv and new assaults on the port city of Mariupol, from where an estimated 20,000 civilians managed to flee through a humanitarian corridor. The fast-moving developments on the diplomatic front and …

Several thousand U.S. Marines and sailors are among the roughly 30,000 troops from 27 NATO and partner countries taking part in Norway’s largest military exercise since the end of the Cold War. The biennial Cold Response exercise kicked off Monday and includes land, sea and air drills. This year’s record …