Old playbook behind North Korea's new nuclear test

The path to Pyongyang's latest nuclear test followed a textbook North Korean strategy: escalating provocations accompanied by furious denunciations of annual South Korea-US military exercises.In the 12 days since Washington praised Pyongyang's "restraint" and held out the prospect of early talks, the North has fired three short-range missiles, sent another one soaring over Japan and detonated what appears to be a full-fledged thermonuclear device."The hydrogen bomb test was a perfect success," a