Earlier this month, Trump set a 50-day deadline for Russia to accept a ceasefire. Failure to do so, the president said, would prompt punishing new economic measures, among them secondary sanctions on nations doing business with Moscow.

The overnight attacks came after President Donald Trump expressed frustration with Russian President Vladimir Putin and brought closer the deadline for a ceasefire.

President Donald Trump says he's "very disappointed" in Russian President Vladimir Putin following massive Russian missile strikes on Ukraine that prompted both Kyiv and Poland to scramble for fighter jets.