At the present, no one really knows who fire the BUK, only thing the west media will do put the blame on pro-Russia rebel and Putin.
Have they think about those rebel was once in the Ukraine army and has been train too, till they can find pieces of the missile no one really know who press the button.
It is not in Russia interest to do that, not that I am defending Russia, we all know what Russians are like they are no angel, in light of what US are doing, (supporting a coup in Ukraine where US interest are concern), they have more to gain than Russia shooting down MH17 if they can put the blame on Putin....:*: