LAUSR

Abstract Iran and Turkey have competed for regional power projection in Syria and sought through cooperation to find a peaceful end to the conflict in the Astana talks, while also at the same time confronting each other in Idlib province via proxies. This simultaneity of competition, cooperation and confrontation in the Syrian Crisis presents a picture of a relationship that is riddled with contradictions and is in effect a paradox. The question that must be asked is, how can we understand this puzzle of competition, cooperation and confrontation in Turkish–Iranian relations in the Syrian Crisis? International historical sociology (IHS) research brings in discussions on the longue durée, narratives, domestic constraints and, most important, the international which can help decipher this intellectual puzzle. Moreover, the ‘relationality’ of each country’s policies in Syria combined with IHS can help unlock the puzzle of the Turkish–Iranian relationship in the Syrian Crisis and provide insight into the debate surrounding the outbreak of war.