That's all well and good, but one would be wise to pay close attention to this corollary quote:

“If the U.S. and South Korea carry out srikes and try to overthrow the North Korean regime and change the political pattern of the Korean Peninsula, China will prevent them from doing so.” 

I don't how Trump's ramping up the rhetoric is useful in the slightest, quite the contrary. NK knows the score if they launch a nuke attack, all Trump's bluster accomplishes is to put the rest of the world on edge, pointlessly.