manpower and firepower is arriving daily. the u.s. is saying that russia could invade ukraine at any time, even before the end of the olympics hosted by russia's ally, china. >> we are in the window when a russian invasion could start at any time if president putin so decides. this crisis, a crisis, again, created by russia's actions in massing forces along ukraine's borders. that there are two paths forward and it is ultimately up to president putin to decide which path to follow. >> as tensions rise, ukraine's president, though, is calling for calm. >> we are on these borders, it's our borders, it's our territory. we have different information and now the best friend for enemies that is paying in our country and all this information that helps only for panic doesn't help us. >> and joining me now is