Timeline of North Korea Nuclear Issues

1950s: North Korea begins nuclear research, focused on energy generation, with assistance from Soviet Union. 1959: Plans begin for nuclear activities near Yongbyon. 1974: North Korea joins the International Atomic Energy Agency, leading to international monitoring of its nuclear work. 1985: North Korea joins the Nuclear Non-Proliferation Treaty (NPT) as a non-nuclear weapons state. 1990: North and South Korea begin talks on nuclear weapons. 1992: Talks result in the 1992 Joint...

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