The U.S. isn’t planning a military operation to help its citizens leave Ukraine, President Biden says, and they should do so on their own. “American citizens should leave now,” Biden said as Russia amasses a military force around its neighbor.

Biden made the remarks in an interview with NBC News’ Lester Holt, who asked him what kind of scenarios would prompt a U.S. rescue mission, if Russia invaded.

“There’s not [one],”