As has been confirmed by Vladimir Putin himself, who has rightfully blamed the Ukrainian government for this tragedy. If those bastards had not attacked the freedom fighters earlier this week, this tragedy could have been avoided!
The black boxes are already in transit to Russia, awaiting their truthful transcription which will show that the Ukranian government scrambled the pilot's transmissions right at the crucial moment, find pictorial evidence showing the Ukranian missile a second before impact, and reveal other incriminating delights!
In other news, the most likely hiding place for that battery of BUK missiles is Vladimir's eminent and firm behind.