I think a big part is NK postures like a threat, but often only meddles in its own affairs in the grand scheme of things. Russia is actively waging a war against Ukraine and China has been provoking trade wars and digital spying/manipulatation. I also think NK size and posturing actually makes the world more ready to deal with them than the other 2 countries. NK is a much smaller nation to monitor than russia or china and since it pretty much only plays hostile, everyone is already a little on edge with them whereas both russia and china want to play by the rules most of the time but can be risky to trust. However I'm just a guy on the internet and I certainly have a flawed view of these countries and the whole geopolitical situation so maybe NK actually deserves 30% in reality.