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unite in common cause.” Patricia Weitsman (1997: 162–5) invokes the term “tethering” to describe how states form alliances in order to manage each other’s potential hostility, with which they may hope to build friendlier relations over time. The League of the Three Emperors had this purpose. Lasting from 1873 to 1880, the German, Russian, and Austro-Hungarian Empires used this alliance in part to coordinate their activities in the Balkans – a region where Vienna and Moscow had been jockeying for control. Indeed, expectations of more generalized conflict might drive alliance formation. Take, for example, NATO enlargement. In the early 1990s, many observers predicted that much instability would come to Europe because the US and Soviet troops stationed on the continent during the Cold War kept a lid on states’ nuclear ambitions and ethnic grievances (see Mearsheimer 1990; Lanoszka 2020b: 453–5). By incorporating former communist countries like Poland into NATO, some US decision-makers and their Central European counterparts believed that they would enhance the European continent’s prospects for peace. Civil–military relations would proceed along democratic lines, whereas norms of territorial integrity would persevere with nationalist conflict managed and risky defense policies discouraged (Epstein 2005).

      Threat-based arguments allow for the possibility that states form military alliances to deal with internal or transnational threats. Steven David (1991) introduced the term “omni-balancing” to describe situations where states balance against both external and internal threats. By internal threats, David meant potential coup plotters or insurgent groups, which may or may not have outside support (1991: 240–1). Accordingly, leaders might align themselves with a strong state that might threaten their own state’s interests but nevertheless can offer assistance against internal threats. David largely focuses his analysis on the developing countries in the Global South, but his argument can throw a light on alliance patterns in Europe. Apart from managing great power competition in the Balkan region, one reason for the League of the Three Emperors was that it offered a vehicle for coordinating imperial power against the troublesome Polish minority whose country the alliance members had conspired to eliminate in the late eighteenth century. A motivation for creating NATO was to protect anti-communist states from internal subversion and fickle publics (Sayle 2019: 2–7).

      And yet, as already noted, the most powerful state today – the United States – has the most allies, many of which lack sufficient military power to deter adversaries on their own. In fact, most existing alliances today are asymmetric – that is, alliances in which military power is largely concentrated in one member. The Mutual Defense Treaty between the Philippines and the United States is one example of an asymmetric alliance. North Korea’s alliance with China is another. Yet these arrangements are puzzling. Should these weaker allies not fear domination by their stronger patron as well? Why would a strong state form a pact with a much weaker state – one that might even be a liability in a war if it is unable to defend itself from another great power? Are such partnerships not superfluous if the great power can rely on its nuclear weapons arsenal as the ultimate source for its security?

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