A look at high-profile U.S. visits to North Korea since 2000:
_ October 2000: U.S. Secretary of State Madeleine Albright visits Pyongyang, meets with North Korean leader Kim Jong Il.
_ October 2002: Assistant U.S. Secretary of State James Kelly visits Pyongyang. He later says North Korea admitted to running a clandestine nuclear program based on highly enriched uranium.
_ April 2007: New Mexico Gov. Bill Richardson visits Pyongyang to recover remains of American soldiers who died during 1950-53 Korean War.
_ June 2007: Assistant U.S. Secretary of State and chief nuclear envoy Christopher Hill makes his first visit to Pyongyang for talks with North Korean counterpart, Vice Foreign Minister Kim Kye Gwan.
_ May 2008: Deputy nuclear negotiator Sung Kim visits Pyongyang to receive logs of North Korea's past nuclear activities as part of six-nation aid-for-disarmament pact.
_ October 2008: Hill makes second trip to Pyongyang to resolve the deadlock in nuclear talks.
_ August 2009: Former U.S. President Bill Clinton visits Pyongyang on a private humanitarian mission to take two detained U.S. journalists home.
_ Dec. 8, 2009: Envoy Stephen Bosworth travels to Pyongyang for talks with North Korean officials on returning to disarmament talks.