Political and military leaders in Europe are fleshing out details of a plan for European forces to help ensure Moscow does not attack Ukraine again once the guns fall silent.

European leaders are racing to develop strategies for the defense of Ukraine—and the region—after U.S. President Donald Trump doubled down on criticism of Ukraine’s President Volodymyr Zelenskyy.

European leaders were summoned by French President Emmanuel Macron in a high-profile display of European coordination on ...

The meeting between Secretary of State Marco Rubio and his Russian counterpart marked a turning point in relations between Washington and Moscow.