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Last Updated: Wednesday, 3 October 2007 First Pyongyang - then Tehran? http://news.bbc.co.uk/2/hi/asia-pacific/7026759.stm By Gordon Corera Security correspondent, BBC News The agreement by North Korea to dismantle its nuclear facilities by the end of the year represents a major step forward in the long, tortuous process of six-party negotiations. But even the most optimistic experts believe there is some distance still to travel. http://news.bbc.co.uk/2/hi/asia-pacific/7026759.stm