laying flowers at a tribute for those who died in last month's protest and to help the new you ukrainian government. as well as an ongoing attempt to isolate russia. >> if russia does not choose to deescalate, our partners will have absolutely no choice but to join us to continue to expand upon steps we have taken in recent days in order to isolate russia politically, diplomatically, and economically. >> and as the u.s. picked its side, russian president vladimir putin finally broke his silence on ukraine. >> reporter: "what can be the reason to use our armed forces," he asked? this is, of course, the last resort. the audience was by invitation and russian only, and each reassurance came laced with a threat. "if we see lawlessness in the east of ukraine, and we are asked for help," he said, "we reserve the right to use all