Ban Ki Moon, South Korea's foreign affairs and trade minister and U.N. secretary general-designate, will pay a two-day visit to Japan from Sunday to discuss the North Korean nuclear threat and U.N. reforms with top Japanese leaders, a Foreign Ministry spokesman said Thursday.

Japan plans for Ban, who will assume the top U.N. post in January, to hold talks with Foreign Minister Taro Aso over dinner Sunday and to pay a call on Prime Minister Shinzo Abe the following day, said Mitsuo Sakaba, the ministry's press secretary. Japanese government sources said earlier that Ban, during his talks with officials here, will reaffirm the cooperation between Japan and South Korea in implementing a U.N. Security Council sanctions resolution against North Korea.