NATO chief says his impression from U.S. is that Russians "are not moving fast enough" to end war in Ukraine

NATO's top official says Russia needs to move more quickly to end the war in Ukraine, and he's been told by the U.S. that Moscow must "do more."

"The ball clearly is in the court of the Russians," NATO Secretary General Mark Rutte said in an interview that will air on "Face the Nation with Margaret Brennan" Sunday. "They are not moving fast enough, is my impression — including the impression I'm getting from my American interlocutors, that — that Russia really has to do more to bring this war to an end."

Rutte, who spoke with Brennan Friday, said the U.S. and its allies in the North Atlantic Treaty Organization are in lockstep on countering Russia and are working in tandem to secure an end to the war in Ukraine and Russian aggression.