Ban has been very involved in issues relating to inter-Korean relationships. In 1992, he served as Vice Chairman of the South-North Joint Nuclear Control Commission, following the adoption by South and North Korea of the Joint Declaration of the Denuclearization of the Korean Peninsula. In September 2005, as Foreign Minister, he played a leading role in the diplomatic efforts to adopt the Joint Statement on resolving the North Korean nuclear issue at the Fourth Round of the Six-Party Talks held in Beijing.