in moscow, edward snowden, the nsa leaker. worried moscow will try to get access to u.s. war plans that snowden could have. >> if they don't have access, you have to assume that they are going to try to get access to it. and that would be very serious. >> so where are we? russian troops on the border with ukraine at a heightened state of readiness. other troops deep back inside russia also on a heightened state readiness, an awful lot would be ready to go, wolf, if vladimir putin ordered them in. >> barbara starr at the pentagon, thank you very much. the cnn exclusive. on the front lines as masked gunmen block from entering crimea. and i'll speak to the organization that oversees these observe observers. plus, extraordinary new video coming in, new reporting, as well, from the front lines of this crisis. i'll speak live with the vice reporter capturing it all firsthand.