Pyongyang’s atomic program has grown “exponentially” since 2009, warns Rafael Grossi, head of the U.N.'s nuclear watchdog.

The report stated that snowfall exceeded 20 centimeters and came with strong winds in areas such as Nangrim, Songwon, Kopung, ...

The United States, in the latest bid to salvage the North Korea nuclear deal, is sending a senior diplomat to meet with North ...

Earlier this year, Pyongyang agreed to disable its nuclear reactor and provide a full accounting of its plutonium stockpile, "acknowledge" concerns about its proliferation activities and its uranium ...

It was unclear whether the facility is at North Korea's main Yongbyon nuclear complex. But it was the North's first unveiling of a uranium-enrichment facility since it showed one at the country's main ...

Michael R. Gordon is a national security correspondent for The Wall Street Journal.

North Korea has long produced weapons-grade plutonium from its widely known 5-megawatt reactor at Yongbyon. The light-water reactor would be an additional source of bomb fuels, and observers say ...

SEOUL--Recent satellite images show North Korea is expanding a uranium enrichment plant at its main Yongbyon nuclear complex, a sign of its intent on boosting the production of bomb materials ...

U.S. military officials were confident at the time that North Korea’s Yongbyon reactor could be taken out without spreading radiation. Now the death toll would be significantly higher ...