In theory, this would be the largest siege and assault operation on the city in modern history. This would require a number of troops commensurate with the total number of Ukrainian armed forces.
And the losses would be huge in any case. In modern conditions, there are major doubts about the realism of operations of this scale. An effective and repeatedly worked out scenario by the enemy can be the demonstrative installation of the flag in one of the iconic places. But! Its main effectiveness is precisely in the case of its application in a situation of "neither peace nor war"