In a statement, NATO said NATO Secretary General Mark Rutte will be in Washington on Monday and Tuesday and meet with President Trump and key administration officials.

Trump said he would end the war in Ukraine within his first 24 hours in office. His patience with Russia's Putin now appears to be wearing thin.

A bipartisan U.S. bill that would hit Russia with sanctions in a bid to pressure Moscow into good-faith peace negotiations with Ukraine has gained momentum this week in Congress, but it still lacks the presidential push it needs to get over the finish line.