Separatist leader Andrei Purgin told the news agency that he was certain that Ukrainian troops had shot the plane down but gave no explanation or proof for his statement. He said he did not know whether rebel forces owned Buk missile launchers but said even if they did, they had no fighters capable of operating them.
Malaysia Airlines Flight MH17 reportedly shot down near Ukraine-Russia border - World - CBC News
So, logically, if the rebels do have a BUK operating, it must be operated by Russians?
Also
A number of airlines said they will avoid the airspace of Eastern Ukraine following the incident.
Angela Mah, a spokeswoman for Air Canada, said the airline had been "proactively" avoiding that airspace for some time.