Don’t forget that Putin could have arranged it himself to continue to gin up support for his catastrophic war. “Look! We’re being attacked! We must conscript another million men!” See also: 1999 apartment building bombings.
I do remember the conjecture that Putin arranged for the explosions at 3 apartment buildings killing at least 300 people, which he used to cement power. This made sense to me then, which is one reason I suspect Russia sabotaged Nord Stream. They were not getting the needed equipment from Canada and Europe was not buying much anyway. So let’s blame it on the US or NATO. I suspected the Kremlin drone was also a Russian act, I just did not imagine it was only a stupid flag argument.