An east-west axis of Azerbaijan and Turkey has grown into prominence within the broader structure of regional dynamics in Eurasia over the past two decades. Yet few, including among policy advisors and policy makers in either of the two states, have attempted to look deeper into the forces that lie behind the workings of this important regional nexus, a reality that resulted in a dual crisis in bilateral relations towards the end of the second decade of interaction. This volume investigates the underlying causes that shaped the dynamics within the structure of the bilateral relationship between Azerbaijan and Turkey. It features chapters by both scholars from the region and international experts in the field, and therefore provides both in-house and outside perspectives on developments within the complex structure of the relationship. With its analysis portfolio including historical, political, economic, socio-cultural, ideological, and international underpinnings of this regional alliance, the volume offers the most systematic and broad ranged analysis of the matter available to date. The book will serve as an important resource for students and scholars of post-Soviet Studies, Central Asia and the Caucasus, and the Middle East, while also being of interest to those of International Relations and political science disciplines.