The propaganda du jour is the separatists were responsible. By even discussing alternatives, ridiculous accusations have come in about "Mish" being a Russian name.
The first casualty in war is always the truth. Statements from both sides are suspect.
Here is another update from reader Jacob Dreizin, a US citizen who speaks Russian and reads Ukrainian, regarding whether or not the rebels had a Buk system.
I told you the rebels have never claimed a high-altitude air defense capability, and despite that "tweet" (which I believe is genuine), I stand by what I said: The rebels do not have a working Buk system.