Methinks nobody knows anything yet. You can’t just pull evidence out of your a@@ five minutes after the fact. I wouldn’t be surprised if Putin did another false flag, like he did against the Chechens. But who knows at this point. Zelensky can’t be summarily ruled out, either. But ISIS wants to take credit. So let them.
I don’t trust either Putin or the Biden gang. Both have motives for a false flag op. I could say that it would be more difficult for the US to stage such a thing in Russia, but I don’t want to underestimate the deep state.