There is absolutely a hint of "only Nixon could go to China" here, where if Obama had accepted a summit meeting with the Koreans with no preconditions the Republicans would have eaten him alive, but Trump can get away with that. Furthermore, some of the reasons for the Korean rapproachment is definitely the South Koreans thinking "OMG we have to change this before Donald Trump kills us all".
But whenever he shows up, 2k5 will correctly point out that even if the Koreans give guarantees about denuclearization, it should be hard for the US to believe any of them. SImilarly, Balta will then point out that, if the United States pulls out of the Iran deal in 2 weeks like Donald Trump insists we're going to do, there would be no reason for the North Koreans to trust any agreement with the United States about removing nuclear weapons, because the United States can't be trusted not to invade you unless you have the bomb.