Thanks for the link, LFS, I had been looking for that story in my usual sources but missed it (I have a paid subscription to WSJ but I didn't check it.) I thought both the US and NKorea had been bluffing. The president of SKorea firmly said yesterday that the US could not engage NKorea without the approval of SKorea. Thankfully this appears to be much ado about nothing, or almost nothing. I suspect Kim doubts his missiles can do what he claims, which is to encircle Guam. Are they accurate? If not, the world would know. Would a handful perform well? What if one of the missiles hit Guam, or even China? Kim's nuclear threat depends on uncertainty.