Nuclear security

North Korea is stepping up uranium production — but for power or nukes?

North Korea has been stepping up its capacity to mine and mill uranium, new satellite imagery shows, raising fears that Kim Jong Un’s regime is trying to expand its stockpile of nuclear weapons.

The images show that a major mill that turns uranium ore into yellowcake, a first step toward enriching uranium, has recently been refurbished, saidJeffrey Lewis, director of the East Asia nonproliferation program at the Middlebury Institute of International Studies at Monterey.