For some reason people think that this is a warning to the United States.
Trust me, Fat Kim is not reassured by this. This is all part of a big game. The object of the game is to remove Fat Kim from power. This is something the Chinese would benefit from. The countermeasures to an ongoing belligerence from North Korea being considered by the United States is not something that the Chinese believe they would benefit from. Maybe they have come to realize that it is in their interest to get rid of Fat Kim.