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North Korea joins the international Nuclear Non-Proliferation Treaty, barring the country from producing nuclear weapons.
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International Atomic Energy Agency accuses North Korea of violating the Nuclear Non-Proliferation Treaty and demands inspectors be given access to nuclear waste storage sites. North Korea threatens to quit Treaty.
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North Korea test-fires a medium-range Rodong ballistic missile into the Sea of Japan.
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North Korea and the US sign an Agreed Framework under which Pyongyang commits to freezing its nuclear program in return for heavy fuel oil and two light-water nuclear reactors.
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North Korea fires its first long-range missile
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North Korea withdraws from Nuclear Non-Proliferation Treaty (NPT)
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North Korea admits publicly for the first time that it has produced nuclear weapons for "self defence".
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North Korea conducts first underground nuclear test
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North Korea test fires seven missiles including a long-range Taepodong-2 missile, which crashes shortly after take-off despite it reportedly having the capability to hit the US.
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North Korea says it is scrapping all military and political deals with the South, accusing it of "hostile intent".
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Tension rises in war of words with US over North Korean threat to fire ballistic missiles near US Pacific territory of Guam. China announces it plans to implement the UN sanctions against North Korea agreed earlier this month, banning imports of coal, minerals and sea food.
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Pyongyang test fires a long-range missile into the Sea of Japan, with some experts stating the missile could potentially reach Alaska.