North Korea disarmament steps face enrichment riddle
Metallurgist A.Q. Khan, admired in Pakistan as "father" of its atomic bomb, was arrested in 2004 for black market sales of nuclear weapons technology to Iran, North Korea and Libya.
North Korea has denied to Hill obtaining gas centrifuges from Pakistan used to purify the type of uranium usable for reactor fuel or weapons, an expert on the dispute, Selig Harrison of the Woodrow Wilson Centre in Washington, told Reuters.
"The key to resolving the stalemate in the promising negotiations with North Korea lies in Islamabad," he said in an email.
(Additional reporting by Jon Herskovitz in Seoul; Editing by Nick Macfie and Alex Richardson)
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