I don’t see anything as bad as Fallujah here. It took the very best America had over a year to subdue Fallujah. At Fallujah, it was irregulars with no air, no support. Afghanistan and South Vietnam were much worse as far as gaining and controlling territory. Take off the blinders. Of course, if you’re going off into the never never land of western disinfo Russian losses, it’s not a serious conversation.
https://en.m.wikipedia.org/wiki/Fallujah_during_the_Iraq_War
Apples and oranges. Iraqi freedom operations started on March 19. By April 9 Baghdad had surrendered. Fallujah was insurgency, which the Russians will experience in spades.