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dilemma to highlight the steep trade-offs that come with commitment-making in the face of possible war. When providing an ally with a broad military commitment, a state may worry that the benefiting ally would be emboldened to have a more aggressive foreign policy than it would otherwise have, thereby upping the risk of some undesirable war. However, weakening a military commitment to offset those so-called entrapment risks could leave the receiving state fearful that its allies will abandon it to the depredations of an adversary. Entrapment and abandonment are thus two sides of the same coin, with severe trade-offs confronting decision-makers when they are designing and managing alliances.

      Taken together, the punchline of Chapters 2 and 3 is that the alliance dilemma is not as pronounced as often asserted because tools are available for addressing it. The trade-offs implied by the dilemma do not always exist. Sometimes states are so aligned in their political interests with one another vis-à-vis their adversaries that they simply do not face such conundrums in their alliance decision-making. Still, certain measures that some observers advocate for addressing contemporary forms of subversion may not be necessary and may even be counterproductive with respect to reassuring worried allies.

      The premise of most contemporary burden-sharing controversies, financially grounded as they often are, is a faulty one, however. The presumption is that allies could contribute to the common defense burden in a more equitable manner. That sounds reasonable enough, but what does it really mean in practice? Chapter 4 notes that part of the reason why burden-sharing controversies arose in the first place is because of how military alliances have come to last longer, a result of how war itself has become so costly in light of nuclear weapons. Crucially, advances in military technology create contradictory incentives when it comes to defense spending. On the one hand, the growing sophistication and complexity of weapons platforms require sustained long-term investment on the part of states to ensure that their militaries do not lag behind their competitors or even allies. On the other hand, nuclear deterrence may make militarized conflict less likely, which in turn drives down the willingness of states to spend on defense. Some states might even believe that spending on conventional military power could make nuclear war more probable. The relationship between defense spending and the collective good of deterrence is, to say the least, hardly linear. Common thresholds for evaluating defense contributions – as in the 2 percent guideline used by NATO – make little sense.

      Recall the earlier standard claim that one motivation for forming alliances is to balance against a shared threat. One implication of this claim is that states can see off their security challenges more effectively in unison with their allies, provided that they have some, than they would without them.

      Proponents of one school of thought – realism – contend that a military alliance exists, or at least should exist, in proportion to the strategic need that gave rise to it. To consider again the first standard claim described earlier, if states no longer have to balance against a particular threat or to have influence over another state for whatever reason, then the military alliance founded for advancing such interests should cease to exist.

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