1. Nations must declare war on each other in caps in game chat with a reason, and must wait for the UN to accept or decline. The UN cannot decline certain reasons for war.
2. Neutral territory will be auctioned by the Swiss bank or UN will split it evenly between the nations of the region.
3. Oil fields are free game everywhere; however, if a nation takes another nation's oil field it's a legitimate reason of war.
4. Nations cannot enter another nation's airspace or land without permission. Trespassing is a legitimate reason for war.
5. Nations can support their allies by helping to defend land or by giving money, but they cannot help invade without UN permission.
6. The UN cannot cancel international wars. Example: If USA declares an approved war on Iran, and other nations back up their respective allies, the UN cannot decline these wars.
7. Threats are a legitimate reason for war.
8. The UN cannot take nuke silos unless the nation has been firing nukes without authorisation.
9. The International community can veto UN declarations or declare a UN rogue with 3/4 majority, rounded down.
10. UN can't stop World War III :-)
Fixed the rules because they're kinda hard to read. Also moved them around, as the rules on accepting/declining wars take precedence over rules about legit reasons for war.
Also, I highly suggest adding something about declaring a nation rogue.