Interesting

Obviously, the US couldn't step in and say this.

Pakistan's former prime minister Nawaz Sharif should honour an agreement to stay in exile for 10 years and should not return on Monday, a Saudi official said on Saturday, citing concern about Pakistani stability.

I don't know Pakistani politics, but it's interesting that ex-PM Bhutto returning is negotiable, but ex-PM Sharif returning is not.
(I think Sharif has military support.)