What term describes the state of mind produced by a credible threat of unacceptable counteraction?

The term that describes the state of mind produced by a credible threat of unacceptable counteraction is deterrence. Deterrence refers to the strategy of preventing an adversary from taking an undesirable action by instilling a fear of the consequences. This psychological factor is crucial in military and strategic contexts because it relies on the adversary's understanding of your capabilities and willingness to act if provoked. Essentially, if an enemy believes that any aggressive move will lead to severe repercussions, they are less likely to engage in hostilities.

The concept of deterrence is deeply integrated into strategic defense and international relations, reflecting how countries maintain peace and stability by dissuading potential aggressors through the threat of a strong response. This not only involves military capabilities but the perception of resolve and the credibility of the threat posed. Large-scale military investments and the readiness to use them enhance the effectiveness of a deterrent strategy.