North Korea’s long-range artillery has little value in wartime, a defector with expertise in North Korean defense capabilities told a South Korean paper.

The unnamed defector, identified as having been involved in supervising the North Korean defense industry, told the Weekly Donga that its artillery forces have flaws so serious that the leaders have had to reshuffle the military’s entire structure with the weapons of mass destruction at its center.

“The Ministry of People’s Armed Forces ran a simulation in the early 2000s and it concluded that it is impossible for them to turn Seoul into a ‘sea of fire,'”