Frozen conflict in Nagorno Karabakh has been representing a threat to the regional stability for the last two decades. Sudden escalation of violence in 2016, known as Four-Day War, spurred new discussions on factors influencing the territorial dispute between Armenia and Azerbaijan. While adversaries explain the conflict as a reaction to military provocations or as a rally round the flag effect, this article explains the dynamics of the conflict through the influence of the third party – Russia. Russia considers the Caucasus to be its sphere of the influence and therefor aims to spread its control through strengthening strategic ties with both Armenia and Azerbaijan in order to prevent the West from projecting its power in the region. Russia’s role of the superpower has therefor a vast influence on the Nagorno Karabakh conflict development.