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This chronology of the North Korean nuclear program has its roots in the 1950s and begins in earnest in 1989 with the end of the Cold War and the decline of the USSR as the main economic ally of North Korea. The Chronology mainly addresses the conflict between the United States and North Korea, while including the influences of the other members of the Six-Party Talks, China, Russia, South Korea, and Japan. The North Korean nuclear program can roughly be divided into four phases. Phase I (1956–80) dealt primarily with training and gaining basic knowledge. Phase II (1980–94) covers the growth and eventual suspension of North Korea’s domestic plutonium production program. Phase III (1994–2002) covers the period of the "nuclear freeze" and Phase IV (2002–present) covers the current period of renewed nuclear activities.〔(【引用サイトリンク】title=North Korea's Nuclear Weapons Programme )〕 ==Phase I== * 1956: The Soviet Union begins training North Korean scientists and engineers, giving them "basic knowledge" to initiate a nuclear program.〔(【引用サイトリンク】title=North Korea's Nuclear Program )〕 * 1958: The U.S. deploys nuclear armed Honest John missiles and 280 mm atomic cannons to South Korea. * 1959: North Korea and the USSR sign a nuclear cooperation agreement.〔 * 1962: The Yongbyon Nuclear Scientific Research Center opens.〔 * 1965: The Yongbyon IRT-2000 research reactor reaches a power rating of 2 MW.〔 * 1974: The Yongbyon IRT-2000 research reactor reaches a power rating of 4 MW.〔 * Between the late 1970s and early 1980s North Korea begins uranium mining operations at various locations near Sunchon and Pyongsan.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Timeline of the North Korean nuclear program」の詳細全文を読む スポンサード リンク
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