countries. mr. putin has already factored additional u.s. financial sanctions into his calculations. but he assumes that some nato allies will be reluctant to follow suit on these ankss and other countries will look the other way. u.n. censure, widespread and vocal international opposition and action from countries outside europe to pull back on their relations with russia might give him pause. forging a united front with its european allies rallying broader support should be america's longer game. otherwise this sawing saw could indeed mark the beginning of the end of america's military presence in europe. so, richard haass, the conundrum might be, you tell me, ukraine is not a part of nato. so how far can president biden go here? >> well, he can go pretty far. he can go far in helping ukraine