The problem with North Korea is that its entire cultural identity is built on resisting American aggression. Without having an enemy to fight, what is the reason for the country going on? Why would the people of North Korea tolerate the current government other than to resist invasion?
The North Korean regime needs conflict. It doesn’t need war, but it needs conflict. Kim could have gotten a sweetheart deal from Trump to end the war and never took it. Why? Because getting rid of the “American threat” also gets rid of North Korea’s legitimacy.