region, russia remains defiant stating that it's part of the solution and not the problem. with more from moscow, here's our report. >> reporter: as the unrest spreads in ukraine's eastern cities, an incident in the black sea reminiscent of the cold war era. u.s. officials tell us a russian plane flew very low as many as 12 times past a u.s. warship this. actions that the u.s. describes as unprofessional and provocative. the closest confrontation that the u.s. and russia have had in a long time, they say. meanwhile, russian president vladimir putin, according to his spokesman, says that he is very worried about events unfolding in eastern ukraine. russia rejecting accusations of the west that it has agents on the ground there, accusing the west of hypocrisy and saying that it does not interfere in ukrainian affairs. >> translator: i would like to say once again that it is not in the interest of russia to