Do states defect from multilateral military coalitions? And if so, how—and why? This book argues that coalition defection is prompted by heightened perceptions of political and military risk. Yet the choice of how to defect—whether to completely withdraw forces or instead find another, less risky way to participate—is largely a function of alliance and international pressures to remain engaged. As such, this chapter lays out the analytic puzzle of contemporary coalition defection, why it is so hard for analysts to detect, and the methodology this book employs to analyse how and why states defect from contemporary coalitions.
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