Ya know, come the right circumstances China may choose to let NK go a step too far, creating a sinkhole for the USA there while China springs another “none of your business” attack elsewhere.
Some megalomaniacs realize flunkies make great disposable distraction targets in a pinch.
China does not want US troops on its border.
The PRC will prevent that at all costs.
North Korea’s people are starving, so a couple weeks more sword rattling, we wil go over and promise them 856 gazallion of foreign aid, including food. Then they will love us,