Pasalao

An adviser to the Ukraine Interior Minister said pro-Russia separatists shot down the passenger plane with a Russian-made Buk ground-to-air missile system. And residents in the area — a stronghold of pro-Russian rebels who are fighting the Ukrainian army — said one of those systems was nearby. 

The Interpreter translated another conversation leaked by the SBU that further corroborates the mounting evidence:

Fighter: Regarding that plane downed in the area of Snezhny-Torez. 

Mykola Kozitsin: Yes.

Fighter: It turned out to be a passenger flight. It fell in the area of Grabovo, there is a sea of corpses of women and children. Now the Cossacks are looking at all this.

Fighter: They're broadcasting on TV that this is apparently an AN-26, a Ukrainian, a transport plane, but "Malaysian Airlines" is written on it. What was it doing on the territory of Ukraine?

M. Kozitsin: That means they were bringing in spies, I don't know. You see.

Fighter: Yes, sir.

M. Kozitsin: What the f**k were they flying in here for, there's a war on.

Fighter: I understand. 

Read more: http://www.businessinsider.com/leak-separatists-discuss-shooting-down-civilian-aircraft-in-east-ukraine-2014-7#ixzz37nmC69B6