here in washington, president biden held a video call with european allies this afternoon to discuss a common response to russia's continued military buildup around ukraine's border. n.a.t.o. announced that it was putting forces on standby and is reinforcing eastern europe with more ships and fighter jets, moves russia denounced, and the biden administration is considering whether to send several thousand u.s. troops and equipment to reinforce n.a.t.o. meanwhile, the state department has ordered the families of american diplomats to leave the country, and they've advised nonessential american embassy personnel and private u.s. citizens should do the same. also tonight, speaker nancy pelosi wants a white house briefing on the ukraine situation for congress. so we have two reports tonight from washington and inside ukraine. cbs's ed o'keefe will start us off from the white house. good evening, ed. >> reporter: good evening, norah, a major shift in the white house on russian shift