World war does not abide by democratic debate.

If Russia is “removed” from the security council (which there is no legal means to do so) they would immediately leave the UN and likely throw the future of the entire UN into chaos.

It would be exactly the same as Japan leaving the League of Nations prior to WWII and would render the UN pointless. Because what would happen then? The UN would condemn Russia? So what? Would a UN coalition decide to intervene? Hello WWIII.

Hence the entire purpose of the security council: prevent direct confrontation of major powers and prevent WWIII by giving them a “do whatever you want card so long as it’s not too bad.”