The Russia-Ukraine war already did that. Ukraine let us talk them into giving up their nukes, and see what happened.

Iran having nukes would mean peace in the Middle East.

Iran having nukes (and recall that in the broader middle east, Iran is largely considered a dangerous enemy) would result in the rest of the middle east pursuing their own nuclear weapons programs to counter Iran. Iran having nukes is a very bad idea - that's why the west , and even countries beyond, have been working for decades to keep Iran from getting nuclear weapons.