Or they could spend some of their treasure on feeding their own people instead of pursuing weapons of war.
Anyone looking for a fight will eventually find one.
http://www.newsweek.com/north-koreas-kim-jong-un-starving-hi...
Anyone looking for a fight will eventually find one.
http://www.newsweek.com/north-koreas-kim-jong-un-starving-hi...
NK leadership doesn't think that they'll survive that step.
China's two concerns are avoiding a refugee crisis, and not having a US ally directly on such a sensitive border.
Seoul would certainly face hardship, but is currently willing to help. (Plus they would be happy to have solved their fear of immanent invasion.) However allowing Seoul to help would leave a US ally directly on China's border.
However Seoul's support is faltering as memories fade. In public polls, 56% of South Koreans think that supporting reunification as "essential", but support is much stronger among older generations. If the stalemate lasts a couple more generations, the two countries may not want to reunite.
This may be fixed with the regime change method with open borders.
I'm sure you are correct that the memory will fade and in turn, the desire to help, when there are no longer families that have to meet across the border.