>>> from nbc news in washington, the world's longest running television program, this is "meet the press" with david gregory. >> and good sunday morning. one week later, the good will from the olympic games has been replaced by an international crisis as russia flexes its military might. how should president obama respond to a crucial test of his leadership after russia sent troops into the cry meania pensula, which is part of the ukraine? secretary of state john kerry calls it an invasion and ukraine has mobilized its army now. it is our top issue this morning. president obama spoking with president putin of russia on saturday after warning there will be costs should russia intervene. i'm joined this morning by the secretary of state john kerry,