The present article examines the intersection of psychoanalysis and International Relations (IR) theory to provide insight into the nature of man, aggression, and the international system. Drawing on Freud's Totem and Taboo, Kleinian object relations, and Lacanian structural theory, it reinterprets major IR paradigms -realism, liberalism, and constructivism- as expressions of psychic structures and symbolic contradictions. Realism is read through paranoid-schizoid defenses and aggression; liberalism through neurotic compromise and repression; and constructivism through fantasy and symbolic misrecognition. The paper proposes that the post-World War II international order can be understood as a symbolic reinstallation of the Father's Law, following Freud's primal horde myth. As this symbolic order erodes, the return of the repressed emerges in renewed forms of aggression, nationalism, and institutional defiance. Clinical structures such as neurosis, perversion, and psychosis are applied metaphorically to describe modes of collective functioning. This interdisciplinary synthesis offers psychoanalytic comprehension into international conflict while expanding the scope of IR theory. The analysis underscores the ethical and clinical insight that symbolic identification, repression, and sublimation are not only intrapsychic processes but also foundations of civilizational (in)stability. In this way, the article invites reflection on how psychoanalytic structures inform political conflict and global governance.