North Korea had agreed to suspend its uranium-enrichment program in exchange for aid. But it has once again threatened to test nuclear weapons.
June 27, 2008 The cooling tower of North Korea's Yongbyon nuclear complex, formerly the most visible symbol of North Korea's nuclear weapons program, is demolished in response to previous concessions from the United States. North Korea later resumed its nuclear activities, but the State Department announced on Feb. 29, 2012, that North Korea will suspend its uranium-enrichment program in exchange for food aid. Gao Haorong/AP Buy Photo