BBC reported it was missing a wing on the way down, so either it just decided to shed its wing on its own or it was knocked off by something. Not too many things flying around in the air that can take off a plane wing.
Okay cool. I don't think Putin would be that obvious since his future bargaining with challengers kind of depends on it. He just sent a message that he can't be reasoned or bargained with.
I mean... The only way Putin didn't intend to kill him is if Putin is so sick he forgot who he is. There's always a chance he wasn't on the plane, but I'm positive Putin wanted him on that plane and wanted it shot down.