Recent activity at Yongbyon and a spate of missile tests by North Korea appear to validate both predictions – reviving concerns about the state of the country’s nuclear weapons program.

The mood was tense in the White House Cabinet room on that summer day, almost exactly 31 years ago. President Bill Clinton ...

WASHINGTON, June 12 (Yonhap) -- Recent satellite imagery indicates the construction of a suspected uranium enrichment plant at North Korea's main nuclear complex in Yongbyon, north of Pyongyang, a ...

North Korea first began operating a nuclear reactor in the 1980s at Yongbyon, according to declassified C.I.A. documents and a report by Siegfried S. Hecker, a former director of the Los Alamos ...

Yongbyon is about 55 miles north of Pyongyang, the capital, wedged between the twisting Churyong River and Yaksan, a mountain extolled in Korean poetry for the beauty of its azaleas.

Significant flooding along a river in North Korea near the country's main nuclear facility may have resulted in damage to the complex, a U.S.-based monitoring website said Thursday.

WorldViews Trump-Kim summit: From Yongbyon site to sanctions, what each side may bring to the table A close look at U.S. and North Korea negotiating positions, and what may unfold next week in Hanoi.

Yongbyon is home to North Korea’s Soviet-designed five-megawatt nuclear reactor, from whose spent fuel the country extracted plutonium to build atomic bombs.

Nuclear Physicist Siefried Heckler was shown the centrifuges at Yongbyon in 2010 but says he and others in his delegation were not allowed a close-up inspection to see whether they were running ...

North Korea added the 5-megawatt, graphite-moderated reactor to its nuclear complex at Yongbyon in 1986 after seven years of construction.

A North Korean nuclear plant before the demolition of a cooling tower, right, in Yongbyon, June 27, 2008. A nuclear watchdog said on Monday that North Korea had restarted its activities at the ...

New satellite images obtained by CNN reveal North Korea is expanding a key facility capable of enriching uranium for nuclear weapons, renovations that likely indicate the country plans to ...