It is a little complicated to follow the North Korea issue through the media.
This battle between the USA and North Korea has continued intermittently for 65 years now. There has been no peace treaty between the two and the huge military exercises of the USA and the South has brought about the development of nuclear missiles in North Korea as their defence against superior military capability.
I think this story from Xinhua explains the Chinese approach.
The four promises of Rex Tillerson and the separate Chinese proposals are a basis for a move towards a solution and a Peace Treaty.
Solutions are a long way off but hearing each other helps.