Russian secret services may have executed the troops suspected of shooting down Malaysian Airlines flight MH17, say sources involved in the investigation of the crash over eastern Ukraine. The Dutch-led probe is leaning towards a conclusion that a BUK missile fired from rebel-held territory downed the Boeing 777, killing all 298 on board. And it is highly likely the aircraft was shot out of the sky by Russian military personnel, according to a report by the Netherlands' state broadcaster NOS, citing anonymous sources in the police and the group of investigators working on the probe into the plane's loss.