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<p>In 1999, President Bill Clinton sent an envoy to North Korea for a rare negotiation aimed at stopping the country’s 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’s episode, visit nytimes.com/thedaily.</p>

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