"The written security guarantee is nothing more than an empty piece of paper that cannot provide any legal guarantee," North Korea's official news agency KCNA said.
Powell suggested that North Korea may have altered that insistence, saying: "They have shifted their language." He would not elaborate.
His comments in the interview come amid speculation that a second round of six-party talks is likely in December despite North Korea's demand this week that Japan be excluded from the negotiations.
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