The work is devoted to the Azerbaijan's position in relation to the events of the Civil War in the North Caucasus on the basis of the diplomatic correspondence of the Foreign Ministry of Azerbaijan Republic with a young British command, the Armed forces of South Russia, the Mountain Republic in 1919-1920. We used the material of the central and regional archives of the Russian Federation, articles and monographs Soviet and modern Russian and Azerbaijani authors. The article deals with the attempts of the Azerbaijani leadership to strengthen its position as much as possible and if possible expand the boundaries of the territories at the expense of the Terek-Dagestan region, occupied at the time the troops of General Denikin, the relationship management of the newly formed Republic of Azerbaijan, the British military command and the High Command of the Armed Forces of the South Russia in the region of the western Caspian region.