The recent findings from the UK researchers have got the Russian govt. in such a tizzy they had to quickly come up with this stinking pile of bull dung to counter.
http://rt.com/news/264205-buk-manufacturer-mh17-ukraine/
Whatever, but the fact remains (and cannot be disputed by either side) that several rebel leaders posted to social media around the exact time of the MH17 downing, bragging about another Ukrainian plane they had shot out of the sky.
While those posts were quickly deleted and the remains of that plane of which they speak never materialized or found, a downed civilian jetliner, MH17, however, was promptly located in the exact same area. Getting to the wreckage and debris if you weren't a rebel was a little dodgy for a few weeks, but, the outside world was finally allowed to get there.
It is a testament to the abilities of the Russian media machine, no matter how silly it can often be, that this issue is still considered up for "debate."