There's effectively no formal relationship between NATO and Pakistan. There have been ongoing discussions with Pakistan because of Afghanistan. Certainly, U.S. chiefs of defence staff have regularly met with their Pakistani counterparts, and the nuclear weapons issue was always a part of that conversation, but that aspect has not been a part of NATO's dialogue with Pakistan to date.
It's something that could be explored in the NATO council. I suspect there would not be unanimous agreement as to what NATO may do in terms of engaging with Pakistan. That's a very controversial subject right at the moment.