amsterdam to kuala lumpur. >> a group of separatists can't shoot down military transport planes or they claim, shoot down fighter jets without sophisticated equipment and sophisticated training and that is coming from russia. >> jim sciutto begins our coverage. >> reporter: the u.s. is already methodically piecing together who was responsible. today u.s. officials confirmed the missile came from within eastern ukraine most likely fired by pro-russian rebels andthy said the rebels almost certainly would have needed russian help to fire the missiles. >> because of the technical complexity of the sa 11 it is unlikely that the separatists could operate the system without assistant from knowledgeable personnel. we cannot rule out technical