For all anybody knows Korea has nothing more than leftovers from the WWII Japanese atom bomb project that took place mostly in Korea.
Although they were building gigantic aircraft carrying submarines as well as jet planes to mount a direct invasion on the American mainland, they didn't succeed in building a working trigger.
That part of their program blew up at Harbin about a month before our first successful test at Alamagordo, NM.
No trigger means no bomb, and our guys are acting like they know exactly what Korea has and can't set off.