Kimjongilia
So you don't think their ideology is influencing these current events? I think I may be looking at it from a different perspective because I identify as a Marxist (I don't know if you do too) and I'm viewing this as a call-to-arms to other disadvantaged and potentially left-leaning nations. The DPRK thinks that they could win a three-day war because of the political consciousness of the army and people as a whole, and that's what they claim makes them "invincible." Thus, they want attention so the peoples of other developing nations will hear about their actions and also strive to become politically conscious.
If that is the case, I would argue they are living very deeply in the cold war. The proverbial battle-lines are well drawn.
Other countries such as Iran, Venezuela, Cuba, China, Etc. Are not going to see this and go "Why... We totally should do this!"
Hell, the entire playing field has moved to an economic one (Notice that when Iran/Venezuela stir up the most fear, it isn't through threats of military action, but threats of disrupting economic actions, causing problems with oil) that is why the great rivalry of our age, America and China, is not shaped by weapons stockpiles as it was in the 20th century, but through an economic batting of horns.
I don't imagine they think they are going to sway anyone to their side by doing this, because the people who would possibly find themselves on their side are already on their side (at least in opposing America)
As for the ideas of "Invincibility" that may be, but many Americans have this "HUR HUR HUR! MESS WITH US AND WE DUN NUKE DA s**t OUTTA YOU!" attitude. That does not mean those who hold power agree.
While they may outwardly claim that sort of thing as propaganda, I highly doubt it would translate to an actual belief in the corridors of power that they would brush aside South Korea, seizing the whole of the peninsula and destroying America's military might in the pacific in three days, simply because "of the political consciousness of the army and people as a whole"
In this scenario, it is important to look through the bullshit being thrown from all sides, set aside the propaganda, and consider what is really happening.