@kravietz that is interesting.
This is a good indication that it is no false flag. The elite is not well like and if it would have succeeded the average bloke would probably cheer for it.
So either UKR (or related group) with a good choice of popular targets. Which seems most likely.
Or Z-radicals starting a quarrel with the regime (somewhat in line with some Prigozhin statements). Which is unlikely, since they might have other means at hand. But UkR should put the blame on them anyhow.