This article draws on international relations theory to attempt a reframing of the Armenian–Azerbaijani conflict in Nagorny Karabakh as an enduring rivalry (ER): a particular kind of interstate conflict known for its longevity and stability. The article begins by identifying a number of conceptual deficits circulating around this conflict, notably the notion that it is a “frozen conflict,” before introducing the ER framework and its analytical dividends for this case. Different layers of the ER between Armenia and Azerbaijan are then explored at systemic, interstate, domestic, decision-maker, and temporal levels, with a view more toward identifying directions for future research than conclusive findings. Among the article's tentative conclusions are the primacy of endogenous over exogenous factors in explaining the durability of the rivalry between Armenia and Azerbaijan, the impacts of the passage of time on the human and physical geography of the territory under dispute, and the convergence of conflict dynamics across disparate levels.
