The Interpreter reports that the Ukrainian military has been claiming that separatists have advanced missiles for a week after the transport plane went down.
An adviser to the Ukraine Interior Minister says the passenger plane was shot down by a Russian-made Buk ground-to-air missile systems.
Read more: http://www.businessinsider.com/malaysian-plane-crash-russia-border-2014-7#ixzz37kAAICUJ
If this is true then the blame will go to Russia for suppying these to the rebels.