Soviet-Bulgarian and Russian-Bulgarian economic and socio-cultural interaction in the Belgorod region in the last third of the 20th century

This article deals with the problem of economic and socio-cultural cooperation between the Belgorod region and Bulgaria. Bulgarian builders and workers have made a significant contribution to the formation of the modern industrial structure of the region. We have analyzed five funds of the State Archive of Belgorod region on Soviet-Bulgarian and Russian-Bulgarian cooperation for the specified period. The relations between Belgorod region and Bulgaria in the 1960-s and 1980-s became an important part of the interstate interaction between Bulgaria and the USSR. They also developed in the 1990s already in the context of the changed political and economic situation in both countries.