. >>> katherine stoner, a a deputy director and senior research scholar at the center on democracy at stanford university. she joins us from there tonight. she is an author and expert on the domestic and international politics. we are joined by yorg forbreg. he joins us from berlin. here in new york, we have david roe, an investigative reporter, contributor to the atlantic. his latest piece: crain is the greatest challenge to geo politics since the cold war. david, ukraine says 30,000 troops are now in crimean, 43 international observers were not allowed to get into crimean. we saw today the truck that witness into this air base that controls the air space in that area and we saw earlier this week how a u.n. envoy was sent away. is putin escalating rather than deescalating? >> i think the issue here is putin is escalating, but in his mind, he's not escalating. the danger here is that the two sides seem to talk past each other. i don't know for sure, but it seems like vladimir putin beliefs it was some western sponsored intelligence operation not a legitimate expression of the will of