This article reflects on the concept of fear in theories of international relations and foreign policy. The text discusses the concepts of the phenomenon of fear and rational behavior emphasizing that the concept of fear, contrary to the concept of anarchy, has no emotional charge in the theory of international relations. Having surveyed the factor of emotions in the theory of international relations and foreign policy, the author suggests that the emotional meaningful charge be returned to the concept of fear. The study stresses that fear (if treated as an emotion) can also have a destructive function disrupting the international system and disturbing the international communication. The third part of the article is devoted to an analysis of the ideas of Lithuania‘s foreign policy. The study explores the idea of Lithuania as a regional leader. The writer claims that the idea was irrational because it was based on the factor of the emotion of fear.