The Russian firm that manufactures Buk missiles has insisted the missile was a model no longer used by Russian forces and said its own investigation showed it had been fired from Ukrainian-controlled territory.
And two days before the JIT was due to publish its interim findings in September 2016, Russia produced radar images which, it argued, showed that the missile could not have come from rebel-held areas.
JIT has said it will examine the new radar data. But critics point out that Russian officials have given different versions of events since the plane was shot down.