I was a bit ahead of a later SA story when I made the above comment.  The later story entitle, "Trump: China, U.S. working on 'North Korea problem,"  says "President Donald Trump asserted today that China was working with the United States on “the North Korea problem,” and his vice president told American and South Korea service members that the North’s latest “provocation,” a failed missile launch shortly before his arrival in Seoul, laid bare they risks they face."  My original comment may be spot on, except for the location where the agreement occurred.  Make that Mar-a-Lago.