Their weapons are used primarily for extortion, which has worked well for them in the past. They over estimate their own influence, because we have always paid them off in the past, and underestimate the power of South Korea, Japan and the U.S.

The Demilitarized zone has protected the north more than the south for the last 2 or 3 decades. The South Korean Army is much better than that of the North.

North Korea is more like a mosquito. It can bite a little, but it is easier to squash than most people think.