The starvation and subsequent permanent deficit of mental development is taking a toll.
For this reason, I would put their odds of actually getting a nuke to work without a “really, really big” industrial accident as very low.
It's almost like everyone is keeping secret the fact that the DPRK's first two test "explosions" were duds. They fizzled.
Insufficient purity in their Pu239...to much Pu240. It's a very difficult purification process...the left the rods in the reactor too long.