Lot's of people have tried trading with North Korea, but they're politically unreliable. China and Russia both try obviously, but so has South Korea. These cooperations usually work for a while but eventually the unreliable reality of the North Korean government wrecks it for them. If it were all America's fault, as these sort of regimes always claim, they'd be able to get on well enough with their neighbors, but they can't.

The United States plays a large role in destabilizing them I went to a lecture at my university where a South Korean professor said as much. He was hardly a fan of the North Korean regime. At this point the regime has zero interest in cooperation, I'm sorry but your government is slowly becoming an authoritarian state in its own right and is currently causing chaos at the behest of Israel a country which just commuted a genocide with the blessing of both parties in your country. Imagine trying to get along with your neighbor when they have billions of dollars of military hardware on your border. No country is to willing to cooperate with North Korea because being in the good graces of the United States is 100x more beneficial. You claim that North Korea can't get along with its neighbors please remind me which country invaded and artificialy divided Korea when they elected some one The United States didn't like.