1) There is no evidence for that. 2) If thinking Russia did it, it's irrational to blow up one's own money-making infrastructure. 3) If thinking it's a separa

1) There is no evidence for that. 2) If thinking Russia did it, it's irrational to blow up one's own money-making infrastructure. 3) If thinking it's a separatist group, it's not a reasonable idea. The technology, tactics, and scale of committing that with a Russian separatist budget without anyone finding out is hard to imagine. It'd be far easier, I imagine, to try to just shoot/grenade Putin than do that.