North Korea seems to have surpassed Iran, in its efforts to develop the advanced technology that produces nuclear material and weapons. According to David Sanger, chief White House correspondent for our partner The New York Times, senior American officials were recently stunned to see that North Korea is far more advanced in its nuclear ambitions than anticipated. The officials visited a new plant at Yongbyon, where North Korea's main nuclear complex sits. Sanger discusses whether this news changes our view of who the more dangerous enemy is: Tehran or Pyongyang?

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