_1994: North Korea, United States sign agreement in Geneva, North pledges to freeze, eventually dismantle, nuclear weapons program in exchange for help building two power-producing nuclear reactors. _Sept. 17, 1999: U.S. President Bill Clinton agrees to first major easing of economic sanctions against North Korea since Korean War's end in 1953. _July 2000: North Korea threatens to restart nuclear program if Washington does not compensate for loss of electricity due to delays in building nuclear power plants.