Unfortunately, the DPRK has proven to be one of the toughest nation states to obtain intelligence on from the inside. I don't have a cite now, but I've read we have exponentially more embedded operatives within ISIS, in Iran, and in Pakistan than we do in the DPRK, where we probably have none at the higher government levels.

Your comment acknowledges a frightening truth: the *only* "intelligence" the Unites States has on the DPRK is from satellites, miles above. That, and a few defectors from in the 80s and 90s, who's intelligence has proven troubling.