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In 1999, President Bill Clinton sent an envoy to North Korea for a rare negotiation aimed at stopping the country\u2019s nuclear development. That was the moment, the envoy says, when everything could have gone differently. Guest: William Perry, the secretary of defense from 1994 to 1997, who went on that diplomatic mission. For more information on today\u2019s episode, visit nytimes.com/thedaily.