1. Ukraine tricking the separatists,The rest of your comment is opinion cloaked as fact. And the question, "who gains?" is completely irrelevant.
2. Ukraine doing the shooting, or
3. the separatists doing the shooting.
“And the question, “who gains?” is completely irrelevant.”
The motive is never irrelevant in an investigation. Tell that to any criminal investigator and they will laugh in your face. It is and has always been the #1 thing.