The summit between President Trump and Kim Jong Un seems to be on again, with a flurry of preparatory meetings. Mr. Trump tweeted Sunday: “I truly believe North Korea has brilliant potential and will be a great economic and financial Nation one day. Kim Jong Un agrees with me on this.” But even to have any chance of defanging the North Korean nuclear menace, there’s one huge concession Mr. Trump must demand from the regime: that Mr. Kim abandon his totalitarian control over North Korea.
This totalitarianism isn’t solely a...