Despite momentous change, NATO remains a crucial safeguard of security and peace. Today’s North Atlantic Treaty Organization, with nearly thirty members and a global reach, differs strikingly from the alliance of twelve created in 1949 to “keep the Americans in, the Russians out, and the Germans down.” These differences are not simply the result of the Cold War’s end, 9/11, or recent twenty-first-century developments but represent a more general pattern of adaptability first seen in the incorporation of Germany as a full member of the alliance in the early 1950s. Unlike other enduring post–World War II institutions that continue to reflect the international politics of their founding era, NATO stands out for the boldness and frequency of its transformations over the past seventy years. In this compelling book, Seth A. Johnston presents readers with a detailed examination of how NATO adapts. Nearly every aspect of NATO—including its missions, functional scope, size, and membership—is profoundly different than at the organization’s founding. Using a theoretical framework of “critical junctures” to explain changes in NATO’s organization and strategy throughout its history, Johnston argues that the alliance’s own bureaucratic actors played important and often overlooked roles in these adaptations. Touching on renewed confrontation between Russia and the West, which has reignited the debate about NATO’s relevance, as well as a quarter century of post–Cold War rapprochement and more than a decade of expeditionary effort in Afghanistan, How NATO Adapts explores how crises from Ukraine to Syria have again made NATO’s capacity for adaptation a defining aspect of European and international security. Students, scholars, and policy practitioners will find this a useful resource for understanding NATO, transatlantic relations, and security in Europe and North America, as well as theories about change in international institutions.

Born from necessity, the North Atlantic Treaty Organization (NATO) has always seemed on the verge of collapse. Even now, some seventy years after its inception, some consider its foundation uncertain and its structure weak. At this moment of incipient strategic crisis, Timothy A. Sayle offers a sweeping history of the most critical alliance in the post-World War II era. In Enduring Alliance, Sayle recounts how the western European powers, along with the United States and Canada, developed a treaty to prevent encroachments by the Soviet Union and to serve as a first defense in any future military conflict. As the growing and unruly hodgepodge of countries, councils, commands, and committees inflated NATO during the Cold War, Sayle shows that the work of executive leaders, high-level diplomats, and institutional functionaries within NATO kept the alliance alive and strong in the face of changing administrations, various crises, and the flux of geopolitical maneuverings. Resilience and flexibility have been the true hallmarks of NATO. As Enduring Alliance deftly shows, the history of NATO is organized around the balance of power, preponderant military forces, and plans for nuclear war. But it is also the history riven by generational change, the introduction of new approaches to conceiving international affairs, and the difficulty of diplomacy for democracies. As NATO celebrates its seventieth anniversary, the alliance once again faces challenges to its very existence even as it maintains its place firmly at the center of western hemisphere and global affairs.

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.

Future NATO looks at the challenges facing NATO in the 21st century and examines how the Alliance can adapt to ensure its continued success For more than 70 years, the North Atlantic Alliance has helped to preserve peace and stability in the Euro-Atlantic area. It has been able to adjust to varying political and strategic challenges. We must ensure that NATO continues to be effective in the future. This requires looking ahead, challenging habitual approaches, exchanging ideas, and advancing new thinking. I highly recommend Future NATO to policymakers, military professionals and scholars alike, as it offers necessary critical and constructive analysis of current and future challenges posed to our security and defence.Annegret Kramp-Karrenbauer, Minister of Defence, Germany Since 1949, NATO has successfully upheld common principles and adapted to new realities. As Future NATO examines, the Alliance is facing a new set of external and internal challenges in the decades to come. The Alliance and its partners need to remain committed to future changes. I recommend this excellent study to all, but especially to the younger generation of scholars and future policymakers. Trine Bramsen, Minister of Defence, Denmark Over the last 70 years, Europe has lived in peace and prosperity because of NATO, with unity as our most important weapon. We may have our differences, but we will continue to work on our common cause to promote peace, security and stability. To effectively do so, NATO needs to continuously adapt to changing security situations. An important current challenge is to ensure European Allies take more responsibility for their security. But we also need to look at future challenges and find innovative solutions for them. Future NATO offers a useful analysis that can help us prepare for what is to come for the Alliance. Ank Bijleveld, Minister of Defence, The Netherlands