Why do states exit international organizations (IOs)? How often does exit from IOs – including voluntary withdrawal and forced suspension – occur? What are the effects of leaving IOs for the exiting state?

Despite the importance of membership in IOs, a broader understanding of exit across states, organizations, and time has been limited. Exit from International Organizations: Costly Negotiation for Institutional Change (Cambridge UP, 2025) addresses these lacunae through a theoretically grounded and empirically systematic study of IO exit. Von Borzyskowski and Vabulas argue that there is a common logic to IO exit, which helps explain both its causes and consequences. By examining IO exit across 198 states, 534 IOs, and over a hundred years of history, they show that exit is driven by states' dissatisfaction, preference divergence, and is a strategy to negotiate institutional change.

The book also demonstrates that exit is costly because it has reputational consequences for leaving states and significantly affects other forms of international cooperation.

NOTE: This book was just awarded the 2026 Chadwick Alger prize for best book in international organizations from the International Studies Association.

Our guests are Felicity Vabulas who is the Blanche E. Seaver Associate Professor of International Studies at Pepperdine University and Professor Inken von Borzyskowski, who is Professor of International Relations at the University of Oxford.

Our host is Eleonora Mattiacci, an Associate Professor of Political Science at Amherst College. She is the author of "Volatile States in International Politics" (Oxford University Press, 2023).

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