Until the 1990s Bulgaria was Mongolia's third biggest trading partner, with agricultural products and light industry goods being the main exports.

[3] The General Secretary of the Bulgarian Communist Party and Chairman of the State Council of the People's Republic of Bulgaria Todor Zhivkov visited Mongolia in June 1985 at the invitation of the General Secretary of the Mongolian People's Revolutionary Party and Chairman of the Presidium of the State Great Khural Jambyn Batmönkh.

[4] Bulgarian parliamentary delegation headed by the Speaker of the National Assembly of the People's Republic of Bulgaria Stanko Todorov visited Mongolia in May 1987.

The General Secretary of the Mongolian People's Revolutionary Party and Chairman of the Presidium of the State Great Khural Jambyn Batmönkh visited Bulgaria 1987 at the invitation of the Secretary General of the Central Committee of the Bulgarian Communist Party and Chairman of the State Council of the People's Republic of Bulgaria Todor Zhivkov.

The Minister of Foreign Affairs of the People's Republic of Bulgaria Petar Mladenov visited Mongolia in July 1987.