Assessing the Fallout From North Korea's Latest Nuclear Test

North Korea has sent the international community scrambling once again. Pyongyang's sixth nuclear test appeared to show substantial progress toward attaining a credible deterrent. In an emergency U.N. Security Council meeting Sept. 4, the United States called for the "strongest possible measures" to be imposed against North Korea. And it is now drafting a proposal for further sanctions, which it hopes to submit for a vote Sept. 11....