Taliban Move Closer to Islamabad - WSJ.com
Well this sucks. A nation with over 50 nuclear weapons came close to having it's capital occupied by a bunch of Islamic extremists bent on the destruction of the west etc etc etc. Although Taliban forces have pulled back, the very fact that they go so close to Islamabad demonstrates the weakness of the Pakistani government and the strength of the Taliban and allies in Pakistan.
Considering that the US has 50,000 troops just across the boarder, any compromise of nuclear control would be very bad. So, hypothetically, if the Government of Pakistan falls, and nuclear control is lost, what options are on the table?