The U.N. atomic agency says North Korea appears to have restarted the operation of its main nuclear reactor used to produce weapons fuels. It comes as Pyongyang threatens to enlarge its nuclear arsenal amid long-dormant diplomacy with the U.S.

IAEA: N Korea appears to have resumed nuke reactor operation

SEOUL, South Korea (AP) — North Korea appears to have restarted the operation of its main nuclear reactor used to produce weapons fuels, the U.N. at...

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