Carnegie Endowment for International Peace
Unlike Tehran, Pyongyang fears external threats more than internal ones and may at most agree to freeze its nuclear program. Though this scenario is arguably the best one imaginable, political considerations in Washington make it all but impossible.
Due to his age, young Kim Jong-un cannot afford to rule the way his aged father did. The old system will not guarantee him another 40—50 years in power. Therefore, he is forced to change it, however risky these changes might be.