MH17 -- Looks like it might have been the Russians

[barbos]

You did not answer my question.

But I am curious, why do you assume that no rebels have required training?
And it seems that you don't base your argument on belingcat, which is curious as well.

I base it on general impression I get from various sources, that it's hard to operate a BUK and it requires a long specialized training. Haven't seen that contradicted anywhere. I suppose, it could be possible that defectors from Ukrainian military could have used the BUK,

Various sources? BUK is pretty old and dumb system with probably hundreds of thousands of people trained to use it in soviet Army. They may have forgotten but still able to use it with some instructions from the manual. Even without any real training, how sure are you some smart teenager who is interested in that stuff would not be able to figure it out? Kids have flown aircrafts using microsoft simulator.

but even then, where did they get it from? The ones they bragged to have captured from Ukraine seem to have been disabled.

It was claimed to be disabled by ukrainians. We don't know what it means, it could meed taking few fuses off.
On a photo it looked intact, so at best they took some electronics off. That's hardly a problem in modern Ukraine, rebels could buy missing electronics from ukrainian army, or simply they had it already from some other place. So, if it was not blown to pieces then it was not disabled.

And if the same BUK was indeed seen in a convoy in Russia just one month before, that would imply that it came from Russia... and could have had Russian operators as well.

I am sorry I don't have time nor desire to follow bellingcat and his theories that's why I asked you, how sure are you that russians are responsible?