North Korea signs the Nuclear Non-Proliferation Treaty (NPT).
North Korea and the United States sign an agreement. North Korea pledges to freeze and eventually dismantle its old, graphite-moderated nuclear reactors in exchange for international aid to build two new light-water nuclear reactors.
October – The Bush Administration reveals that North Korea has admitted operating a secret nuclear weapons program in violation of the 1994 agreement.
February – The United States confirms North Korea has reactivated a five-megawatt nuclear reactor at its Yongbyon facility, capable of producing plutonium for weapons.
April – Declares it has nuclear weapons.
February 13 – North Korea agrees to close its main nuclear reactor in exchange for an aid package worth $400 million.
September 30 – At six-party talks in Beijing, North Korea signs an agreement stating it will begin disabling its nuclear weapons facilities.
December 31 – North Korea misses the deadline to disable its weapons facilities.
June 12 – The UN Security Council condemns the nuclear test and imposes new sanctions.