Trump was able to get them to the table
Which was its own disaster. There were numerous mixed messages from Trump and the rest of his team resulting in one failed negotiation after another and basically abandoning the entire process.
Your threshold for success is about as low as it can go.
How so? They ended the war with SK, ended up, got NK to actually get in the same TIME Zone as SK and the rest of the world, got NK to stop firing rockets, got them to agree to halt their nuclear test, stopped them from conducting the military "exercises," got them to resume ship to ship communcations, got the two nations to actually compete together as Korea, in the Asian Games, work together in the film industry, got families reuninted for the first time since the 50s! and for the first time, EVER, got the countries to not label one another as the enemy or a threat! Massive steps were made as a result of the Trump Admin