Eltab
Lord of the Hidden Layer
I have not heard responsibility assigned to any particular unit (yet). It could have been a non-Army (but Russian Government) unit - think the S.S. or Gestapo units in WWII - whose job is to implement Party policy, distinct from State policy. It could have been one of the 'mercenary' units, which to my observation have been brought in exactly to threaten civilians "you better give up now or these guys will get really mad" and work themselves up to creating an atrocity.I am pretty sure the civilians in, say, Bucha, would say there's nothing "paper" about the tiger.
If Bucha was committed by a typical regular unit, then yes the Russian Army is a paper tiger, wandering off its primary objectives to grab an easy "win" that is no military challenge or display of skill at all. How hard is it for a tiger to kill a mouse?