The reason North Korea remains as it is, is fairly simple. Originally a tool of communist expansion, it's no longer in a position. It stopped being one since the 90's. It's a political tool, a loose cannon type at that. It's used by China to throw off most of it's neighbors who compete with it's claims to resources, land, and in a way acts a buffer against the American influence there. Also, North Korea is a nice source of labor for China, who despite having low wages, can outsource work to even lower wages. North Korea is in a way, a state that exists solely to justify the sphere of influences for both, and even the US. In other words, it's a proxy. Don't be fooled though, though North Korea is not a true threat to the world, it's not a pushover either. Many view it as just a toothless dog controlled by China, but it's not. It's army, training, and strategic location means that China, has several things to exploit in a war. North Korea would also be a costly thing to try and change or take. All those troops, even if armed with only bricks could bog down any invasion. It's strategic location means it can act as a threat or buffer to any country depending on it's own needs or china's. It's nuclear program is a shoddy set up, but possibly a collateral that can never be risked. Even if the government is seen as insane, inept, and stupid. It's probably done on purpose, not only to maintain power, but also to show anyone that it's a cornered dog with rabies to it's enemies. Taken seriously or not, no one wants to risk that chance all of it is real. Even China, plays along with this. Claiming it has influence, but also no control. No one is entirely sure how much a hold China has on that country, but it's clear that China would like to take any advantage it can to gain some ground in international politics. So there you have it, a country that is really, just an anomaly. Kept that way by everything around it. It's weird, the Korean people were never truly divided, until international affairs split it in two. Everyone wants to rejoin, but no one can move while it's leaders, and backers, are played off against each other. When it comes down to it, to the eyes of many Koreans, America and China are the culprits for this split. Maybe they are right, for better or worse, they probably wouldn't be divided otherwise.