"North Korea is more than just another nation joining the nuclear club. It has never developed a weapons system it did not ultimately sell on the world market, and it has periodically threatened to sell its nuclear technology. So the end of ambiguity about its nuclear capacity foreshadows a very different era, in which the concern may not be where a nation’s warheads are aimed, but in whose hands its weapons and skill end up. " - from the New York Times online.