Amid indications that North Korea has restarted its chief nuclear reactor, the latest sign the nation plans to renew its nuclear weapons program, policymakers confront a big question: What should be done about it?

In a report released Thursday by the U.S.-Korea Institute at John Hopkins University, researchers viewed commercial satellite imagery from mid-September showing hot wastewater flowing from an underground pipe leading from the Yongbyon reactor facility.

“The most likely explanation is that the reactor is now operating and the generators are producing electrical power,” the analysts wrote.

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