MissBlossom What if the nations all got together and started some kind of league, through which they could promote world peace?
It would be a beginning. The biggest barrier to getting anything sensible done is unanimity. Since, for example, in the Security Council each of the permanent members has a veto, no action will ever be taken if one of the powers represented is involved in the conflict.
I think binding decisions and sanctions should be decided by a two-thirds majority.