I do not believe Pakistan has the moral prerogative to "bill us" for anything. They should take our handouts and payments whenever we feel like remitting them, and if they bark, we should show them footage of what a Daisy Cutter looks like.
America and Europe have extremely short memories, and the Pakistanis know this. We should never let them forget that we gave them an easy way out of the mess they got themselves into, and therefore they need to be on their best behavior.