Of course most people are sure that Russian associated rebels are responsible for the bringing down of the plane. Ukraine is desperately trying to link it directly to Russian troops under orders from the Russian Army. To do so would be a great propaganda win for them. Indeed it is quite possible that they are right - I wouldn’t be taking their word on too much though until we see a full investigation.
I wonder if ISIS brings down a Jet Airliner if we will be looking at Obama and Cameron for supplying them with similar weapons.
There is some evidence that ISIS has had MANPADS, but no evidence that they’ve had an air defense missile as sophisticated or capable as the one fired by Putin’s proxies.