Yonhap reports, citing a leading South Korean official
No further details at this point, but I'll update if there's anything worth noting. I would assume it's just another missile test but you can never really rule out anything these days.
Update: Projectile launch was said to be at 1630 local time and was fired eastward from northwest. Doesn't look like it's anything too serious but this continues to undermine the "trust" in the relationship between Kim and Trump surely.
