The words are flying fast and furious between the US and North Korea.
We've heard all week about Pyongyang's threats to hit at the US, possibly by launching a missile.
Well, Friday at a press conference in Seoul, Secretary of State John Kerry warned the North that that would be a "huge mistake."
Kerry also called on China to put "teeth" in its efforts to reign in North Korea, DPRK.
"No country in the world, has as close a relationship or as significant an impact on the DPRK than China," Secretary Kerry stated. "China has an enormous ability to help make a difference here."
Kerry plans to deliver that message in person, when he visits China Friday.
Kerry's statement hasn't elicited a Chinese reply yet.