An overnight Ukrainian drone attack has sparked a fire at an oil depot in Sochi, the southwestern Russian resort that hosted the 2014 Winter Olympic Games, local authorities say.

WASHINGTON—In a warning to Russia, President Donald Trump said Friday he’s ordering the repositioning of two US nuclear submarines “based on the highly provocative statements” of the country’s former ...

The reciprocal attacks from both sides comes at the end of one of the deadliest weeks in Ukraine in recent months, after ...