President Trump’s agreement Tuesday with North Korean dictator Kim Jong Un had better not mark the end of negotiations, because if it does, our dealmaking chief executive got much the worse of the encounter than his counterpart. It wasn’t even close.

By meeting with Kim, Trump legitimized him. That was worth doing if it leads to the end of North Korea’s nuclear threat. Were Kim to give up his nuclear weapons, or even just his missile program, tensions in the region would become far more manageable.