In my 3.5 years of living here, I have seen China’s attitude towards North Korea change in the following order:
– Defending North Korea’s actions
– Saying nothing about its actions
– ‘Inviting’ North Korea up for a talk about its actions
– Criticizing North Korea for ours actions
– and now preparing against its actions
I suspect more news propaganda to appear and something to happen within 3 years at best.