Under UNSCR 1373 Pakistan has the binding sovereign obligation to eliminate terrorists, terror havens, etc. from its territory. As Pakistan has failed to comply, it has no sovereign grounds to object when others attack terrorists on its territory, either through drone strikes or through raids like the one that killed OBL - or if India decided to pursue LeT. The memo, then, maps a framework for Pakistan to REGAIN that lost sovereignty. (As a second function, it caters to the Pakistani military's fears about the U.S. targeting Pakistan's nukes by reassuring the U.S. of its "discipline".)