now the officials are saying they believe that to definitely be the case. what is new is that they believe since the shootdown of flight 17 that that launcher and other missile that's were operational have been brought back across the border. and the implication here is that russia is trying to scrub the scene of the crash site and cover up any evidence that might implicate it in having supplied this missile to the separatists. they do not know whether russian operatives were in eastern ukraine and actually fired that missile. what officials do know is that these separatists if they fired it, had to have had some training from the russians. this is not as we've been discussing an operational system that is really good to go. officials say it doesn't matter though. it doesn't matter whether russian officials actually fired the missile or whether russia just gave the separatists the missile with the instruction manual and said go to it. the u.s. does believe russia has serious culpability here.