In Russia that is what they're telling the people what really happened. The media is spinning up people to the point where the majority of citizens now want to invade Ukraine for staging the crash/shoot down.
The fact that not even a shred of wreckage of the lost MA plane has ever shown up anywhere would lead to the logical conclusion that it did not crash. It seems to me that the most likely scenario is that it was in fact taken over in mid-air, somehow the hijacker killed everyone (wearing a gas mask, say), and shut off the transponders. We will see that plane again when we really don't want to. I'm not sure that's a conspiracy theory, I just don't see how the facts as we know them today leading to any other conclusion.
If that's the case then who do you think it was? First thing to pop into your mind was probably russia. First thing that pops into my head is al Qaeda, but they usually brag about things immediately. One of two things would be true if this theory is proven correct. 1. It was russia, and this was an act to build approval so that they can invade all of Ukraine. 2. Who ever did it wanted it to look like Russia, hoping to start World War III