Suddenly Kim wants to hold a love in. I think he could have found a better place than fifties buildings on the border.
If he is serious it should be possible the give him a non aggression treaty that has him stand down his nuclear and rocket programs, very hard to maintain if you are a bankrupt state, and he could even become friendly with the US and others, just as Vietnam has. I expect Xi has explained this to him, probably a condition of benefiting from China's belt and road