U.S. urges Americans to leave "now" as Ukrainian city far from Russian border braces for influx of evacuees

Lviv — With President Biden warning on Thursday that Russia was "moving toward an imminent invasion" of Ukraine, CBS News senior foreign correspondent Charlie D'Agata said the message to Americans in the country could not have been any clearer: Get out before hostilities start.

"The situation could worsen very quickly, and we're very worried about that and are urging all Americans to leave the country now," Chargé d'Affaires Kristina Kvien, the most senior U.S. diplomat in Ukraine, told D'Agata.

Her call was made more urgent by satellite images appearing to show even more Russian forces, and a new pontoon bridge just a few miles from the border with Ukraine.