Abstract The post-2020 escalations in the Armenian-Azerbaijani conflict, culminating in the Azerbaijani military offensive of September 2023 and the subsequent mass exodus of the Armenians from Nagorno-Karabakh, once again underscored the persistent deadlock in the peace process and the failure to achieve compromise. This article aims to analyze the genesis of maximalist attitudes within Armenian and Azerbaijani societies in the years preceding the 2020 war, as well as the factors contributing to the endurance of these attitudes in the years that followed. Drawing on the analysis of maximalist attitudes formation during the interwar period (1994–2020), the research delves into the obstacles encountered by peace activists and peacebuilders in their efforts to counter dominant nationalism, alongside other challenges and structural impediments in the peacebuilding process. Finally, the study investigates the determinants that shaped the post-war attitudes in Armenia and Azerbaijan preceding the pivotal events of September 2023.