[Brian Griffin]

If Russian forces are at the gates of Kiev making further headway means urban combat. For what purpose? To get a Big Mac at a Kiev McDonald’s?

Once a city is surrounded the invader should let the stomachs of the residents of the city fight the battle.

[Alas Babylon!]

It takes a hell of an army to lay siege to a city.

The numbers required to close off every escape/supply route are bigger than the numbers to try force out all the enemy resistance.

[OKSooner]

Good question. Maybe a plausible answer might be that there's a particular person(s) or thing(s) that they might have as an objective.

Don't ax me to speculate on what those could be... except honestly I don't see how Zelenskyy himself would be worth moving into a city like that for them. But then again I wouldn't know anyway.

Talk about having the home field advantage...