Aye that's pretty much what I meant by forming our own UN. I just figured that having a set of rules, we should include what to do in case someone gets bored of "playing nice"
Well considering it's a World War scenario, I should expect war to happen. It's brutal things like massive civilian bombing, nukes, and breaking alliances that massive international pressure should bring.
Also, war withtout CB. But that's simulated in game, since war without sufficient CB raises all your neighbors' CB against you.