The World War II Japanese occupation of the Korean Peninsula ended in 1945 when the United Nations gave control of the North to the Soviets and the South to the United States. Separate nations - North Korea and South Korea - were established in 1948. But North Korea, seeking unification, invaded the South in 1950, sparking the Korean War in which the UN supported the South, and China and the Soviet Union backed the North. The uneasy cold-war legacy of confrontation-rapprochement-confrontation has characterized the past half century:
1968 North Korea seizes the USS Pueblo, a Navy spy ship; its crew of 83 is released 11 months later.
1969 North Korea shoots down a US spy plane over the Sea of Japan; its 31-member crew perishes.
1976 In the "ax murder" incident, North Korean troops kill two US Army officers as they prune a tree in the demilitarized zone to improve surveillance.
IN PICTURES: Who has nukes?
1988 US imposes sanctions on North Korea, which is added to a list of state sponsors of terrorism.
1989 US satellite photos show a nuclear reprocessing plant in Youngbyon.
1994 Former President Jimmy Carter flies to Pyongyang to try to broker a deal over its nuclear program.
1998 North Korea launches its first long-range ballistic missile.
2002 President Bush names North Korea, along with Iran and Iraq, as part of an "axis of evil."
2003 North Korea withdraws from the Nuclear Non-Proliferation Treaty. Six-party talks over North Korea's nuclear program begin in Beijing. …