Back a long, long time ago, Alexander the Great was, well, kicking the world's ass. Anyways, he came to a junction where he faced a superior army that he couldn't beat conventionally. So, he gathered his horses, and began to charge towards the enemy force. But he retreated. He then repeated this again, and again, and again. Finally, the foreign army stopped coming to alert when they heard the tramples of his horses and men. That's when Alexander struck, and decimated the ranks of his enemy.
Look, I'm not saying that North Korea is going to do something, but let's not keep our guard down. Okay? Okay.
Luv,
M.T.
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It is also wise to remember, Kim is basically a newbie to his country. His country still adores and worships him like with his father, but, he's new, and therefore figures he needs to prove himself to his people.