Unblock the path to peace in North Korea

North Korea can use its missiles and nuclear weapons for leverage; it is motivated by a complex mix of economic distress and security fears; and it holds an almost pathological distrust of the United States. [...]as with the Soviet Union, the world should expect North Korea to hedge its bets, engage in brinkmanship and cheat on its agreements. [...]there is currently no way of estimating how much weapons-grade uranium North Korea has produced. [...]the international community does not know how much uranium or plutonium was consumed in North Korea's weapons tests. [...]in 1988, a group of non-government scientists from both the United States and the Soviet Union shored up confidence in the proposed Comprehensive Test Ban Treaty by demonstrating that even small, conventional explosions could be detected at a Soviet nuclear test site, using seismic monitoring.