Allegedly, if this was done by the rebels, they could have used the hardware taken from the Ukrainian army. This would have nothing to do with Putin.
Well, except for the fact the rebels want to be an independent Russian state, occupying the juiciest part of Ukraine, under Putin, who has been aiding them "secretly", whom they hope will, and have repeatedly called on to, aid them. (Pardon the grammar.)
One has to hope that the crew who pulled the trigger will confess their crime, and kill themselves. Ritualistically, to indicate they have some sense of honor.