South is pretty cool. North Korea is one of the most restricted countries in the world. For an industrialized society, it is the most censored in what information is allowed in and what information is allowed out. Surprisingly little is known about them, relative to how much we know about other countries. They are like a much smaller scale Nazi Germany, but without the racism. They do have absurd punishments for crimes, like life of manual labor. American journalists are often sentenced to years of manual labor for crimes determined seamingly on a whim, such as taking photographs of certain things after being allowed into North Korea to take photographs. But that's not to downplay how many North Koreans are sentenced to manual labor. Most inmates, I believe.
It's a pretty shitty place. The propaganda is hilarious, though. It's sad in that people believe it, since they only received censored 'facts.' But it's hilarious from a third party perspective.
Official history involves unicorns and their previous leader being born under a rainbow.
I'm sure it would be. I'd fear for Europe though who is much closer to China than the U.S. And probably Japan too. I don't know enough about their position on North Korea to guesstimate what they'd do. Maybe stay neutral? I don't know. This isn't my area of expertise, so I'll stop while I'm ahead.
N.Korea and China are very close allies. Our last war with Korea almost resulted in direct war between the US and China. technically US and Chinese forces fought in Korea but at one point US troops pushed to far north and China lost their shit.
The general position of the US and China are if their part of Korea is invaded/opposed by the other nation then they are going in. Japan is a very close ally of the US and anti-Chinese power, they do not want China to be the regional power in Asia. The issue with this is that China is also anti-Japanese power.
What happens and where fighting spreads depends on what happens. If there i only fighting along the boarder between Korean troops with indirect conflict between China and the US then it's just that. If China makes power plays because of the confrontation you're looking at major international action. Taiwan and Tibet would be easy for China to invade/annex like they have wanted to for years. Both of which have written guarantees of US action against China in the event they try. There are also some islands that people feel have oil around/on them that are disputed that would be a tactical target for China in the event of confrontation. You also have to deal with the fact that China and Korea are nuclear. China can hit the US, Korea can't but they could get into Europe.
It makes tactical sense that if China is going to fight the US they'd launch an attack on US soil, though they'd also have to hit Europe.
Nuclear force is likely only to come from Korea and China will discourage it though.If Russia sides with China and they work out a plan you could see something happening.
I don't know where Russian Sino relations stand, they tend to not like each other. It's more beneficial for China to try to get Korea to shut up and back off till they can build more power at least. hough it could be a US Israel situation where you have Korea ignore China, do what it wants and drag China into something. In that situation it's still doubtful they do anything beyond fight to standstill.