It would be poetic justice but I dont think things will go to such an extent.
Pakistan's usual black mail means nothing to US. bcos
1) Afghanistan is not that much important as syria. Syria is seen as russia's attempt to reestablish itself as main player. it is more of a power struggle less to do with terrorism.
2) Russia will not send its troop afghanistan, that would be the most stupid mistake. Why shed blood for no gain? they have already had their lessons.
3) Again who the hell is going to trust pakistan
. Every one knows who is supporting taliban and who will benefit from this exercise.
Pakistan will try to convince world powers to send troops knowing very well such a thing will not happen. Then what?
Then pakistan will send its own troops and do what it wants, eliminate all taliban rivals. ISIS is just a ruse. why in the world would ISIS be interested in afghanistan? The so called ISIS are nothing but TTP.