nuclear powers have plunged to new cold war era low in the past couple of years and this is a big opportunity to cool down the tone and make some progress on common ideas if progress could indeed be made. now, vladimir putin is expected to arrive here in geneva in about two hours, maybe a little more, and he will head straight to the lake wide villa, he is set to arrive there before president biden. ahead of the summit we have seen these adversaries take a couple of swipes at each other, mr. biden did not back down calling his russian counterpart a killer and mr. putin went out of his way to praise former president donald trump. now, president biden has just wrapped up meetings with nato, the eu and the g7 and they are part of a concerted effort to shore up western support ahead this have summit. our own phil mattingly has more. >> america is back and which is why we're here in full force.