North Korea's Nuclear Program
How North Korea went from a small reactor to a nuclear arsenal, and why decades of diplomacy have failed to stop it.
The Path to the Bomb
North Korea's nuclear program dates to the 1960s, when it received a small research reactor from the Soviet Union. By the 1980s, Pyongyang was developing its own plutonium production capability at Yongbyon. The first nuclear crisis erupted in 1993-94 when North Korea threatened to withdraw from the Non-Proliferation Treaty (NPT).
The 1994 Agreed Framework, negotiated under the Clinton administration, froze North Korea's plutonium program in exchange for fuel oil and two light-water reactors. The deal collapsed in 2002 when the US accused North Korea of a secret uranium enrichment program, and North Korea accused the US of failing to deliver on its commitments. Both sides bore responsibility.
North Korea conducted its first nuclear test in 2006, followed by tests in 2009, 2013, 2016 (twice), and 2017. The 2017 test was likely a hydrogen bomb with yields estimated at 100-370 kilotons — far more powerful than the Hiroshima bomb.