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This chapter examines how war fits into the study of international relations and the ways it affects world politics. It begins with an analysis of the work of the leading philosopher of war, Carl von Clausewitz, to highlight the essential nature of war, the main types of war, and the idea of strategy. It then considers some important developments in the history of warfare, both in the West and elsewhere, with particular emphasis on interrelationships between the modern state, armed force, and war in the West and in the global South. Two case studies are presented, one asking the question about what is global about the global war on terror (GWOT) and the other examining the GWOT in the context of war and society, looking at Afghanistan, Iraq, and the United States.

This chapter examines whether international relations, especially in an era of increasing globalization, are likely to be as violent in the future as they have been in the past. It asks whether globalization increases or decreases international security, which international relations theories best help to provide an understanding of global security and insecurity, and what are the most important contemporary threats to international security. The chapter first considers existing disagreements about the causes of war and whether violence is always likely to remain with us. It then discusses traditional/classical realist and more contemporary neorealist and neoliberal perspectives on international security, along with a range of alternative approaches. It also explores recent debates about globalization and geopolitics. Case studies in this chapter explore insecurity in the post-cold war world and tension in the South and East China Seas.

This chapter examines the claim that realism offers the most powerful explanation for the state of war that is the regular condition of life in the international system. It first provides an overview of the theory of realism before discussing whether there is one realism or a variety of realisms. It argues that despite some important differences, all realist theories share a set of core assumptions and ideas. It goes on to consider these common elements, namely self-help, statism, and survival. The chapter concludes with an analysis of the extent to which realism is relevant for understanding the globalization of world politics. To illustrate the main ideas tackled in this chapter, two case studies are presented. The first looking at Kautilya%#x0027;s realistic thought. Kautilya was a key adviser to Indian king Chandragupta Maurya (c.317–293). The second case study considers the impact of Russia's annexation of the Crimea.