I think the Korean news is a bunch of hype. The only people that maybe should worry about North Korea are the Global corporations harbored in South Korea.
Like South Vietnam businesses had to worry about North Korea. Going further back, Global businesses had to worry about Cuba throwing them out. I assume when Iran won its independence, even THEY probably threw out a bunch of global corporations.
I myself have no sympathy for Global businesses. They created Globalization. They are not patriotic, and owe no allegiance to any one country. They are totally out for themselves, and have all the politicians from around the world in their pocket.