British Prime Minister Keir Starmer arrived in Ukraine Thursday, pledging to help guarantee the country’s security for a century days before Donald Trump is sworn in as U.S. president.

Japan's government has inaugurated a new mission and ambassador to NATO, making the country's representation to the alliance independent from the Japanese embassy in Belgium.

On NATO, Rubio repeatedly called it a “very important alliance.” He suggested NATO members should pay their fair share and be ...