Looking back at history, one might reasonably conclude that small states are destined to be on the losing end of geopolitics. Events of the last decade in particular do not give us much reason for optimism about the destiny of small states facing coercion at the hands of their larger and more powerful neighbors. Russia used force against Georgia in 2008, has been using force against Ukraine since 2014, and could prospectively use force against a number of its other neighbors. China, for its part, has used a variety of coercive techniques in its territorial disputes with its neighbors. One common feature of these situations is an explicit effort by the coercing state to stay below the thresholds of a military response and, in particular, outside military intervention. As a result, small states have largely been left to their own devices to defend themselves against their more powerful neighbors...