That would be a correct theory if you assumed that Iran is a rational actor. There is no evidence this is the case. I would actually argue that NK is a fairly

That would be a correct theory if you assumed that Iran is a rational actor. There is no evidence this is the case. I would actually argue that NK is a fairly rational actor, if a slightly volatile one. Their "enemy" is Emmanuel Goldstein, they understand the US won't invade them but it is useful for them to pretend they will. If Iran got a nuclear weapon, they would use it. No questions, they used chemical weapons before, they have gassed and bombed civilians, they don't care anymore (btw, the theory you are proposing was suggested before...Boris Johnson suggested it, he proposed giving a nuclear weapon to Iran, I studied IR, I am aware of the theory...it only works when a country has an incentive to not use nuclear weapons).