It was apparently a Russian medium-range SAM, probably a Buk. At least, according to the Ukrainian Interior Minister. Now, that might be a battery they smuggled to their special forces in Ukraine, but a SAM is complicated and expensive technology. I doubt Ukrainian rookies could aim and fire it without direct Russian help. Of course, it's definitely been supplied by the Russians. This comes one day after the Americans identified some photographs of Grad missiles being fired as on the border of Ukraine - on the Russian side.
What I want to know - what happened to the Malaysian jet's IFF? Did the Malaysians not turn it on, or could the Russians not detect it?