What's next?

Ok, the United Nations has decided to intervene in Libya. A no fly zone has been declared and UN forces will be allowed to attack any military formation threatening the rebels. The U.N.'s actions do beg the question What is next?

Will they move into Bahrain? People who want freedom there are be oppressed and killed. Saudi troops are in the country to help do it. Will the U.N. send forces there to stop that? Odds are they won't. Which then begs the question Why not? What is the line that separates the use of force in a situation like that? The U.N. has drawn a line in the sand but will it be applied equally everywhere?