This book identifies contemporary military coalition defections, builds a theoretical framework for understanding why coalition defection occurs and assesses its utility for both the scholarly and policy practitioner communities. Drawing upon the author’s own experiences managing the Afghanistan coalition for the Pentagon, the volume builds a relevant policy and practical understanding of some of the key aspects of contemporary coalition warfare. Ultimately, it concludes 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 international and alliance pressures to remain engaged.

This book improves our understanding of battlefield coalitions, providing novel theoretical and empirical insight into their nature and capabilities, as well as the military and political consequences of their combat operations. The volume provides the first dataset of battlefield coalitions, uses primary sources to understand how non-state actors of varying types form such groupings, reports interviews with policymakers illuminating North Atlantic Treaty Organization operations, and uses cases studies of various wars waged throughout the nineteenth, twentieth, and twenty-first centuries to understand how other such collectives have operated. Part I introduces battlefield coalitions as an object of study, demonstrating how they are distinct from other wartime collectives. Using a novel dataset of actors fighting in 492 battles during interstate wars waged between 1900 and 2003, it provides, for the first time, a comprehensive portrait of the universe of battlefield coalitions. Part II explores processes and dynamics involved in the formation of battlefield coalitions, addressing how potential coalition members prepare for future battles in peacetime (as well as the consequences of such preparations) and the dynamics of mission design. Part III focuses on how battlefield coalitions are organised and fight when combat ensues, notably their decision-making rules and practices, command structures, and learning capacities. Part IV addresses three curious tendencies observed in the operations of battlefield coalitions: partners under-providing effort in combat, rebels and terrorist networks persisting in cooperation even when their interests diverge, and members defecting from the collective. Part V concludes with a chapter outlining for future researchers what we know about battlefield coalitions and what remains to be understood. This book will be of much interest to students of military and strategic studies, defence studies and International Relations.

Some of the most brutal and long-lasting civil wars of our time involve the rapid formation and disintegration of alliances among warring groups, as well as fractionalization within them. It would be natural to suppose that warring groups form alliances based on shared identity considerations - such as Christian groups allying with Christian groups - but this is not what we see. Two groups that identify themselves as bitter foes one day, on the basis of some identity narrative, might be allies the next day and vice versa. Nor is any group, however homogeneous, safe from internal fractionalization. Rather, looking closely at the civil wars in Afghanistan and Bosnia and testing against the broader universe of fifty-three cases of multiparty civil wars, Fotini Christia finds that the relative power distribution between and within various warring groups is the primary driving force behind alliance formation, alliance changes, group splits and internal group takeovers.

This timely Research Handbook provides novel insights into the institutional complexities of the North Atlantic Treaty Organization (NATO). Through a defined focus on the post-Cold War evolution of NATO, it provides various theoretical perspectives on the Alliance and assesses wider research efforts within NATO studies.

Based on intellectual openness and an interest in transdisciplinary perspectives, this edited volume introduces scholars of African Peace and Security to innovative methodological and conceptual approaches, offering new insights into the inner life of APSA.

This is an open access title available under the terms of a CC BY-NC-ND 4.0 License. It is free to read, download and share on Elgaronline.com. This timely Handbook offers a detailed cross-policy assessment on the need, locale and impact of regional cooperation and integration, addressing how the principles of regional integration have affected multi-level governance and subsequent public policy. Individual chapters provide explanations of what regional cooperation means in a specific policy area, identify relevant theories, and present empirical evidence to support the arguments outlined.

NATO, the most successful alliance in history, is beset by unresolved tensions and divergent interests that are undermining its cohesion, credibility and capability. In this new book, Mark Webber, James Sperling and Martin Smith explore four key post-Cold War developments that threaten NATO's survival: an overextended geostrategic reach and an unwieldly security policy portfolio; a failure to address capability short-falls and meet defence spending benchmarks; US weariness and European wariness that call NATO into question; and intra-alliance discord over Russia’s place in the European security order and how to deal with Moscow’s destabilization of Georgia and Ukraine. The authors propose in response a range of policy options that could reinvigorate NATO, but conclude with a note of caution. Alliances come and go and most are cast into the dustbin of history. If NATO is to avoid this fate, it must not only address the major problems that trouble it, but also get to grips with future challenges to alliance cohesion and credibility, from Brexit to the emerging contest with China.

A new perspective on how the nation-state emerged and proliferated across the globe, accompanied by a wave of wars. Andreas Wimmer explores these historical developments using social science techniques of analysis and datasets that cover the entire modern world.

Russia's February 2022 invasion of Ukraine triggered the bloodiest war in Europe since World War II and raised significant questions about the United States' role in Europe. This CSIS report examines the U.S. force posture in Europe---including the military capabilities, personnel, infrastructure, and agreements that support defense operations and plans---and makes recommendations for future U.S. posture. It finds that the United States needs a robust, long-term military force posture in Europe, focused on the North Atlantic Treaty Organization's (NATO) eastern flank, to deter future Russian aggression.