most effective weapon that can be used against North Korea is spreading the knowledge of how the rest of the world lives....I’m telling you from first hand experience, they would not believe it. Take a defector into a Px or just a grocery store in South Korea, and they think it is a Hollywood set to impress them.
They have some knowledge. Defectors have mentioned that Western movies get smuggled in from time to time. But they can’t do anything about it.
They cannot comprehend a Walmart but many North Koreans work outside the country and communicate with their families. Japan has a large NK population.