It's not a surprise that these comments came on the heel of the China Trade Talks. You can be sure that China is doing all it can to use it's ally North Korea in trade talks with the U.S. At the end of the day, North Korea is what it always has been to the communist party of china, a bargaining chip against the West and particularly, America.
As I said before, a lot is riding on the China Trade Talks including major geopolitical issues including North Korea, Iran and Syria, etc. All of these issues are intertwined. China knows it, Trump knows it. The cards are stacked against a positive outcome on the Korean Peninsula mainly because it is in China and Russia's backyard and South Korea has been appeasing both the North as well as China. Hope for the best but prepare for the worst. There is doubt within the intelligence community about Kim's intentions for these talks and agreements with the South. I have predicted it will not turn out well. Let's see.