I think this is pretty much the heart of the matter. China has been using NK to distract us while they build their hegemony in the South China Sea. BUT, without trade imbalance with the US, China could not easily become a world power. They chose to fight over agriculture (soy beans) because they calculate Trump is most vulnerable there politically; but we can always find new customers for agricultural products.
Trump needs to stand firm on NK and trade... The Democrap and Republican gnats will keep pestering him - STAND FIRM! China stands to lose immensely!
I think youre spot on!