I think it was interesting in that article that they were asking for help officially as 'for help from the Al Quaeda' however by the way the article is written that is not a real problem.. just the 'official' reason.
I really dont see how putting in US military will help defuse any nuclear talks, to me it would seem only to flare them up even more. If you think about it.. pakistan is going to see that the US is coming in to help India.. well . I don't know about you, when I see street fights and somebody brings in a friend.. the other guy gets PRETTY pissed! Its not a 'fair' fight anymore.
So what do they do? They go and get a friend

Hopefully its not their trusty friend nuke