And then ask yourself, how did they get that footage if they were not involved?
ISIS has quite a history of claiming actions they had nothing to do with.
Don't you think it is the wiser thing to wait until the Russians disclose what they found? After all, they do have the perps, and I'm pretty sure they have a way to make them talk.
You can believe Biden and his cronies, who declared within hours it was ISIS -- but I'm not stupid enough to rely on their "word." It's useless.