Well I believe that what you have down as the "Nuke" option will be the ultimate choice, much to the detriment of the United Nations. The Regional Option also seems somewhat likely. Already things are deadlocked and the addition of more veto powers will not fix that. As you can probably tell I'm not a fan of this.

For the UN to function as a true International Government it must be Democratised. Veto powers must be completely removed and a more representative Security Council should be set up. 7 of the "Senior" nations should be rotated through and I believe that 2 of the "other" nations should be as well. A majority of the SC should agree to any act that goes through so that no single nation *COUGH* United States *COUGH* can veto everything. My ideal situation would be no SC and everything done with a plurality of nations agreeing to it, but I realise this cannot work with the current situation in the world. As a side note I also believe that there should be more officials elected to fill posts, such as the Secretary-General.