China is thorwing away North Korea?

Seemingly, Chinese government has cooperated with North Korea until now. But it was found that China warned North Korea of it's military provocations and the use of armed force. China has been blamed by the world for it's ignorance about economic sanctions & the improvement of human rights against North Korea. But China seems to be anxious about North Korea's unilateral behaviors. (testing nuke, provocations toward South Korea, 3 generations of succession) A few days ago, China said North Korea, "if they attack South Korea again, they must not help North Korea anymore." and they informed South Korea of this. it's difficult for us to guess China's plot, but it looks obvious that China is gradually fed up with North Korea's stupid diplomacy.