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on the partner’s territory in the absence of an alliance treaty. Another option is to provide security assistance. This can involve the transfer of weapons, especially those that are largely defensive in character so as to lower the risk of the recipient starting an unwanted war of its own. The United States decided against extending a treaty commitment to Israel in the 1960s and the 1970s, but stepped up its arms transfers in part to ensure that Israel would not be outmatched by its Arab rivals. Not long after abrogating a treaty alliance with Taiwan in 1979, the United States supplied it with weapons as a means of deterring China from launching an assault across the strait (see Yarhi-Milo et al. 2016). As former Assistant Secretary of State for Political-Military Affairs Andrew Shapiro once remarked, “[w]hen a country acquires an advanced US defense system, they are not simply buying a product to enhance their security, they are also seeking a relationship with the United States” (2012: 20).

      Unfortunately, communication in international politics is not straightforward precisely because the anarchic environment creates uncertainty: states can say one thing but do another, without worrying too much about being held to account by a higher authority. There is no one thing that all states can say or do to achieve deterrence or assurance. Otherwise, every state would then be doing that one thing. Statements of interests can thus be muddy.

      The solution to this problem is to take actions that are costly enough that not every state would perform them. Costs come in two forms: ex ante and ex post. Ex ante costs refer to sunk costs that states must pay before performing an action; they can include buying armaments and deploying military personnel abroad. Ex post costs reflect measures that may not be felt immediately but nevertheless can constrain future decision-making options (Fearon 1997: 70). According to this rationalist perspective, only in rare cases when interests are completely and obviously aligned – that is to say, identical and harmonious – would states not have to pay costs to demonstrate their support for one another. As may be possibly true of Israel and the United States, “the shared interest carries the entire relationship, and therefore that relationship need not be negotiated formally” (Morrow 2000: 64).

      An alliance treaty also generates ex post costs by way of tying hands and, therefore, creating commitments. Signing a treaty might only be worth the cost of the paper on which it was written at the outset, but it conveys the state’s intent to come militarily to the aid of another under certain conditions. The public nature of such a treaty creates reputation costs that the signatory state would incur if it decides to renege on promises made to its ally. That signatory state might come to be seen as duplicitous and an unreliable partner for others that confront similar challenges. Faced with greater distrust, the unreliable state would be forced to make more concessions in order to assure potential allies in the future. The ex post costs can also be domestic, especially in a democracy. If domestic legislators ratify a treaty, then they may not wish to see the executive violate the agreement when its obligations are operative, because the national interest, in their view, would be harmed as a result. No such constraints purportedly exist in the absence of a treaty. As such, leaders may feel that they have to fulfill their alliance commitments (Gaubatz 1996; Leeds and Savun 2007; Leeds et al. 2009).

      agree that an armed attack against one or more of them in Europe or North America shall be considered an attack against them all and consequently they agree that, if such an armed attack occurs, each of them … will assist the Party or Parties so attacked by taking forthwith, individually and in concert with the other Parties, such action as it deems necessary, including

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