By George Friedman Founder and Chairman On Jan. 29, I wrote a piece that described North Korea's strategy as a combination of ferocious, weak and crazy. In the weeks since then, three events have exemplified each facet of that strategy. Pyongyang showed its ferocity Feb. 12, when it detonated a nuclear device underground . The country's only significant ally, China, voted against Pyongyang in the U.N. Security Council on March 7, demonstrating North Korea's weakness. Finally, Pyongyang announced it would suspend the armistice that ended the Korean War in 1953, implying that that war would resume and that U.S. cities would be turned into "seas of fire." To me, that fulfills the crazy element. My argument was that the three tenets — ferocity, weakness and insanity — form a coherent strategy. North Korea's primary goal is regime preservation.