In 2006 North Korea raised its well-honed skill at brinkmanship to a new height. In July it tested seven missiles and, three months later, a modest-sized plutonium-fueled bomb. The response of the United Nations Security Council was swift, imposing on North Korea stringent sanctions.
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Errata: In the September/October 2016 issue (volume 56 number 5, pages 836 and 849), there was a technical printing error in Figures 1b and 2 of the article by Ajay Raina that resulted in a loss of data on the graphs. This online article contains the restored figures in their original, correct state. The error is regretted.