The US needs to make sure the Pakistani nukes do not fall into fundamentalist Islamic hands. Thats the only reason we have anything to do with them and we should have ended that a long time ago...but we need to figure out a way to take care of their nuclear weapons. I am sure there are all sorts of contingencies written up and hopefully some day the opportunity will present itself.
I have my own thoughts on that score...in any case, the Pakis need to be either completely free of the Islamic radicals or the nukes, they cannot have both and the US and others need to make sure that happens.