I mentioned this idea already in another thread that was devoted to fixing tech trading via the UP , but I figured that this should be in a thread of it's own.
Why can't the UP have a military like the UN does today? Granted that military is made up of other country's military, but it could be used similarly...
For the UP to exist, all the civs contribute a percentage of their income to allow the UP to function and build up a military that can be used when a civ is being horribly abused or ganged up upon by other civs. Think of it as a galactic police force that enforces the resolutions made or one that helps those who are truly in need.
While this is only an idea, this version of the UP would make game play more interesting. It would be nice to actually go against resolutions which would result with a realistic penalty. A fine for a minor disobedience, being thrown out of the UP for a serious crime, and lastly the UP warring against you with their own military if you do something inexcusable. They could even call upon others to help in the war. This would be a better punishment than losing all your trade routes if you decide to leave.
If civs were performing crimes against other civs or disobeying resolutions, an emergency meeting could occur where votes would be taken deciding what needed to be done to stop whatever was happening. Think of the politics that could be used in this.