Completely agree with you that the N Koreans aren't up to the sophistication or advancement, but that technology is being put in N Korea's hands by someone. We usually disagree on China, but I think that's the most likely source. Russia is a good second candidate, but it's China's sphere of influence, and China has the most to be gained by allowing N Korea to be a distraction in the region. China is no novice at arming and supporting proxies to fight wars of attrition that the Chinese themselves don't want to fight.