down, john bernham in, telling cnn the ukrainian claim that their missile was responsible is believed to be credible. as for just how credible, one other source familiar with the latest intelligence says the u.s. believes ukraine s version of events, which russia disputes, with, quote, medium competence. ukraine s national security adviser speaking to cnn s fred pleitgen tonight had this warning for vladimir putin. translator: that is our gift to him, and this is just the beginning. this is just the beginning. there will be more than one moscova. more on this tonight which has been a galvanizing development in the war, also a nuclear weapons warning for russia in response to finland and sweden now considering joining nato and there are multiple developments on russia s building offensive in eastern ukraine, senior american defense official tonight says russian troops pulled from their defeat in northern ukraine are now appearing in the east.