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In its broadest sense, diplomacy refers to the conduct of human affairs by peaceful means, employing techniques of persuasion and negotiation. In the more specific sphere of international politics, through the utilization of such techniques, it has come to be regarded as one of the key processes characterizing the international system and a defining institution of the system of sovereign states—often referred to as the “Westphalian” system after the 1684 Peace of Westphalia. Its usage, however, embraces some important distinctions. First, at the state level, it has frequently been used (particularly in studies of diplomatic history) as a synonym for foreign policy—as in “Russian,” “German,” and “Japanese” diplomacy (foreign policy). More commonly, however, it is used to refer to one means by which such policies are implemented. Second, viewed as an institution of the international system, a distinction can be made between diplomacy as a set of processes and as a set of structures through which these processes are conducted. Debates about the continuing utility of diplomacy in contemporary international politics frequently reflect confusion between these meanings. In the course of the following discussion, the origins of diplomacy are outlined, together with differing analytical approaches to its nature and significance as a feature of international politics. The changing nature of diplomatic processes is then discussed, followed by an examination of the evolution of the structures through which diplomacy has been conducted at both the state and international levels.

Theoretical Approaches

While the study of diplomacy has a long and honorable tradition dating back to Machiavellian thought, it is only in recent years that diplomatic practice has started to receive detailed theoretical attention. There is a notable absence of conscious theorizing in much of the scholarship on diplomacy. Instead, the bulk of the scholarship offers detailed historical accounts of diplomatic events (diplomatic history) as well as texts on diplomatic practice. Most scholars of diplomacy implicitly choose from a very narrow range of analytical frameworks drawn almost exclusively from the realist tradition in international relations (IR). As a consequence, the orthodox study of diplomacy has been marked by a remarkably unified theoretical approach—something quite unique in political science. There is a surprising ontological consensus about what diplomacy is and who the diplomats are. This consensus arises from the dominant influence of rationalist thinking. The upshot of this dominance is that the range of the scholarship in a majority of studies of diplomacy tends to be limited to analysis of the international realm of sovereign states in the context of high politics. There is little enthusiasm among mainstream scholars to explore the diplomatic world beyond interstate relations or low politics and that relating to the nonpolitical. This is now changing. There is a growing body of work interested in diplomacy not simply as a foreign policy tool of states but as a means of connecting cultures, polities, economies, and societies. This section aims to highlight briefly the orthodox and unorthodox approaches to the study of diplomacy.

Diplomacy and Realism

The realist core of orthodox approaches to diplomacy is undisputed and is clearly evident in a number of key features found in this prevailing approach. The most telling is the focus on the sovereign state as the primary unit of analysis in diplomacy such that the study of diplomacy is confined to the study of the process and content of interstate relations—that is, how sovereign states seek to engage with each other. Prevailing models of diplomacy focus almost exclusively on singular state-to-state relations. The orthodoxy defines diplomacy as processes of communication, negotiation, and information sharing among sovereign states. Diplomatic processes revolve around the activities of professional diplomats—that is, officials of foreign ministries and overseas missions. More common, especially in North American scholarship, is the narrower definition of diplomacy as a foreign policy tool of states—that is, diplomacy as statecraft. This more limited definition has led to a great deal of foreign policy analysis passing itself off as diplomatic studies, despite the fact that it does not consider the processes of interstate relations as its main focus. Both definitions, however, share the view that diplomacy has an ordering role to play in the otherwise anarchic and unstable international system of states—a view that has theoretical roots in realism. Successful diplomacy, it is argued, creates a system of states. It constructs balances of power, facilitates hegemonic structures, and fashions post-hegemonic regimes. When diplomacy fails or is absent, conflict and war usually follow. Indeed, it is the very fact of conflict between states (a core realist assumption) that warrants the emergence of diplomatic systems.

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