Each time the world witnesses cycles of North Korean provocations or nuclear diplomacy, or both, Korea watchers and specialists question whether deterrence is possible or feasible. The answer to this question has become more complex over the past several decades because the object of deterrence—the number of undesirable North Korean actions—has grown in tandem with Pyongyang’s growing military capabilities. The expanding scale, scope, and number of North Korean actions the United States and South Korea wish to deter has, in turn, naturally caused confusion in the international discourse, resulting in frequent use of the term “deterrence” without clarifying the target(s) of deterrence and by conflating the definitions of deterrence, compellence, and other foreign policy tools. Any answer to the fundamental question of whether deterrence is possible vis-à-vis North Korea depends on the target(s) of deterrence, which necessitates a clear definition of deterrence and clarification of the target behavior(s) for deterrence. Based on this clarification, the policy objective can then be defined, followed by an identification of the appropriate foreign policy tools to use to achieve the designated objective.
Deterrence is a strategy aimed at discouraging an adversary from taking an unwanted action (usually military in nature) by raising the cost of that action and instilling credible fear of the consequences. Nuclear deterrence discourages an adversary from using nuclear weapons for fear of retaliation. Once an adversary has already taken an unwanted action, however, deterrence has failed and the question becomes one of compellence—persuading or forcing an adversary to give up something it already possesses or to terminate an ongoing action(s)—or the use of other policy tools. Compellence is harder to execute than deterrence because it requires persuading an adversary to change its existing behavior (e.g., taking an action it otherwise would not take) and a credible commitment to act against the adversary by imposing costs (e.g., threat to inflict punishment) in the event the adversary refuses to comply, or actually executing a costly action (e.g., following through on the threat), both with a deadline. Deterrence, on the other hand, is not associated with a deadline to act against an adversary.
Read the full article in the Council on Foreign Relations' Asia Unbound blog.