Honestly, the closed society of North Korea needs to step back and think about this for a moment.
Let’s say they do in fact have missiles capable of reaching the United States, do they think our missile defense systems would just let it through? There are defense systems within Southern Korea, as well as the 1000-plus other America military bases throughout the world, as well as within the coastal waters of our nation.
Check it out, it’s straight from North Korea. This propaganda video shows a timeline of the horrific Korean war, leading up to today and ending with a nuke on DC. Apparently, they don’t know about our air defense systems.