Andrey became a member of the party in 1963 and began a career in the foreign service. He helped represent Bulgaria in the United Nations and Comecon. He rose through the ranks of the foreign service to become minister of foreign economic affairs in 1987, resigning in 1989. Lukanov became a leading member of the reformist wing of the BCP, and took part in the overthrow of longtime leader Todor Zhivkov. He became prime minister on February 3, 1990. This office he held until December 7, 1990. Midway through his tenure, the Communist Party rebranded itself as the Bulgarian Socialist Party.