Russia isn't going to give ****, this would be the third airliner they have shoot down (the other two being South Korean). They will stick with the story that the Kev govt did it, not their bobos in East Ukraine. The separatist probably wouldn't know who to operate the BUK system without Russian help or Ukrainian military defectors.
Well, the separatists are led by Ukraninan military defectors with help from Russia special forces.