Non of the above. USA is a superpower. All they have to do is decalare at the UN Assembly that nuclear weapons were siezed at Kennedy New York Airport and that they have proof that Pakistan was complicit. US secretary of state pulls out a piece of paper and says this is testimony of a Pakistani smuggler.
Gives Pakistan 2 weeks to destroy it's nukes. Meantime prepares a force in Afghanistan to launch "Operation Enduring Indus" in 14 days. End off. Meantime gets Saudia Arabia, GCC, Kuwait, Europe, Japan, India etc to join in condemning Pakistan.
Have you seen this before? Yes Iraq 2004.