This open access volume surveys the state of the field to examine whether a fifth wave of deterrence theory is emerging. Bringing together insights from world-leading experts from three continents, the volume identifies the most pressing strategic challenges, frames theoretical concepts, and describes new strategies. The use and utility of deterrence in today’s strategic environment is a topic of paramount concern to scholars, strategists and policymakers. Ours is a period of considerable strategic turbulence, which in recent years has featured a renewed emphasis on nuclear weapons used in defence postures across different theatres; a dramatic growth in the scale of military cyber capabilities and the frequency with which these are used; and rapid technological progress including the proliferation of long-range strike and unmanned systems. These military-strategic developments occur in a polarized international system, where cooperation between leading powers on arms control regimes is breaking down, states widely make use of hybrid conflict strategies, and the number of internationalized intrastate proxy conflicts has quintupled over the past two decades. Contemporary conflict actors exploit a wider gamut of coercive instruments, which they apply across a wider range of domains. The prevalence of multi-domain coercion across but also beyond traditional dimensions of armed conflict raises an important question: what does effective deterrence look like in the 21st century? Answering that question requires a re-appraisal of key theoretical concepts and dominant strategies of Western and non-Western actors in order to assess how they hold up in today’s world. Air Commodore Professor Dr. Frans Osinga is the Chair of the War Studies Department of the Netherlands Defence Academy and the Special Chair in War Studies at the University Leiden. Dr. Tim Sweijs is the Director of Research at The Hague Centre for Strategic Studies and a Research Fellow at the Faculty of Military Sciences of the Netherlands Defence Academy in Breda.

Detterence is the most basic concept in American foreign policy today. But past practice indicates it often fails to work - and may increase the risk of war. Psychology and Deterrence reveals this stratgy's hidden and generally simplistic assumptions about the nature of power and aggression, threat and response, and calculation and behavior in the international arena. Most current analysis, the authors, note, ignore decisionmakers' emotions, preceptions, and domestic political needs, assuming instead that people repond to crisis in highly rational ways. Examining the historical evidence from a psychological perspective, Psychology and Deterrence offers case studies on the origins of World War I, the 1973 Arab-Israeli conflict, and the Falklands Wars as seen by the most important participants. These case studies reveal national leaders to be both more cautious and more reckless than theory would predict. They also show how deterrence strategies often backfire by aggravating a nation's sense of insequrity, thereby calling forth the very behavior they seek to prevent. The authors' conclusions offer important insights for superpower bargaining and nuclear deterrence.

This foreign policy analysis textbook is written especially for students studying to become national security professionals. It translates academic knowledge about the complex influences on American foreign policymaking into an intuitive, cohesive, and practical set of analytic tools. The focus here is not theory for the sake of theory, but rather to translate theory into practice. Classic paradigms are adapted to fit the changing realities of the contemporary national security environment. For example, the growing centrality of the White House is seen in the 'palace politics' of the president's inner circle, and the growth of the national security apparatus introduces new dimensions to organizational processes and subordinate levels of bureaucratic politics. Real-world case studies are used throughout to allow students to apply theory. These comprise recent events that draw impartially across partisan lines and encompass a variety of diplomatic, military, and economic and trade issues.

"Deterrence by Denial: Theory and Practice is the first study to focus exclusively on contemporary denial, bridging the theoretical gap that persists between classical deterrence theory and contemporary insecurity. The book significantly advances the scholarship on deterrence by denial with empirically driven and policy-relevant contributions written by leading international scholars of conventional military aggression, missile defense, terrorism and militancy, crime, and cybersecurity. Deterrence by Denial: Theory and Practice is an important and unique book, of interest to scholars of international relations, political science, terrorism and intelligence studies, and cybersecurity, as well as to policy analysts, practitioners, and members of the armed forces and intelligence community"--

Deterrence as a strategic concept evolved during the Cold War. During that period, deterrence strategy was aimed mainly at preventing aggression against the United States and its close allies by the hostile Communist power centers--the Union of Soviet Socialist Republics (USSR) and its allies, Communist China and North Korea. In particular, the strategy was devised to prevent aggression involving nuclear attack by the USSR or China. Since the end of the Cold War, the risk of war among the major powers has subsided to the lowest point in modern history. Still, the changing nature of the threats to American and allied security interests has stimulated a considerable broadening of the deterrence concept. Post-Cold War Conflict Deterrence examines the meaning of deterrence in this new environment and identifies key elements of a post-Cold War deterrence strategy and the critical issues in devising such a strategy. It further examines the significance of these findings for the U.S. Navy and Marine Corps. Quantitative and qualitative measures to support judgments about the potential success or failure of deterrence are identified. Such measures will bear on the suitability of the naval forces to meet the deterrence objectives. The capabilities of U.S. naval forces that especially bear on the deterrence objectives also are examined. Finally, the book examines the utility of models, games, and simulations as decision aids in improving the naval forces' understanding of situations in which deterrence must be used and in improving the potential success of deterrence actions.

For decades, the rational actor model served as the preferred guide for U.S. deterrence policy. It has been a convenient and comforting guide because it requires little detailed knowledge of an opponent’s unique decision-making process and yet typically provides confident generalizations about how deterrence works. The model tends to postulate common decision-making parameters across the globe to reach generalizations about how deterrence will function and the types of forces that will be "stabilizing" or "destabilizing." Yet a broad spectrum of unique factors can influence an opponent’s perceptions and his calculations, and these are not easily captured by the rational actor model. The absence of uniformity means there can be very few deterrence generalizations generated by the use of the rational actor model that are applicable to the entire range of opponents. Understanding Deterrence considers how factors such as psychology, history, religion, ideology, geography, political structure, culture, proliferation and geopolitics can shape a leadership’s decision-making process, in ways that are specific and unique to each opponent. Understanding Deterrence demonstrates how using a multidisciplinary approach to deterrence analysis can better identify and assess factors that influence an opponent’s decision-making process. This identification and assessment process can facilitate the tailoring of deterrence strategies to specific purposes and result in a higher likelihood of success than strategies guided by the generalizations about opponent decision-making typically contained in the rational actor model. This book was published as a special issue of Comparative Strategy.