I don't think you quite understand my point. The missile system being moved from Ukraine to Russia is evidence in itself that Russia has involvement with these rebels as far as armament is concerned, something of which they deny. Although they could claim it was a Ukrainian buk I suppose, but Russia are still complicit in whatever these rebels are doing.
So your saying that it being moved is proof that Russia gave it to them, however it could also be one of the Ukrainian ones they captured?