The next version of an international council needs actual authoritative power. There’s no point if someone just decides they don’t want to listen and will do whatever they want. Veto power should be curtailed if a supermajority of countries are in agreement otherwise a bad actor will push their weight around.
There’s also financial power. The UN could be a trade group that refuses to do business if you don’t follow the rules.
Remember, humans used to exile the horrible people as a way to keep the community safe. It doesn’t have to be murder.
The UN already does that, too. It’s called sanctioning.
But in reality, even the “good guy” EU countries happily keep on buying Russian oil.
It’s just magically transformed into Indian oil first, by being loaded onto a different ship in an Indian harbor.
That sounds like an expensive pain in the ass for Russia to me. Or, a “peaceful deterrent”, if you will…