Wow. More juvenile posturing, or the beginning of the end for North Korea? Depends on whether anyone takes them seriously. And with a growing nuclear capability, they can't be taken not-seriously. This is suicide for them.
Joel Skousen has an interesting analysis. North Korea attacks South Korea, the US defends South with tactical nukes. Then there is a nuclear strike on the US from Russia and China in retaliation, which might explain why the US gov is building super bunkers in the Ozarks .
A simple visit to his website, and wikipedia page, convinces me that Joel Skousen is about as non-authoritative a source as one can possibly get on this subject.
> Then there is a nuclear strike on the US from Russia and China in retaliation
This is a huge jump in logic without any explanation.