This article explores the legal, economic, and institutional repercussions of geopolitical conflict and great-power foreign policy decisions for Brazil, with particular attention to the tensions involving the United States and Iran. It adopts an interdisciplinary analytical framework at the intersection of Public International Law, Constitutional Economic Law, and the General Theory of the State in order to assess how external coercive dynamics reverberate within the Brazilian constitutional order. The analysis is organized around three core dimensions: the domestic effects of unilateral economic sanctions, the tension between state sovereignty and systemic interdependence under financial globalization, and the challenges that the judicialization of international disputes poses to Brazil’s Democratic Rule of Law. Methodologically, the study is based on qualitative research, employing a deductive approach and an exploratory-analytical design supported by bibliographic and documentary sources. The article argues that Brazil’s integration into the contemporary international system generates structural vulnerabilities that exceed a strictly domestic legal response. In this context, the protection of constitutional guarantees and institutional stability requires a more robust normative and institutional framework, capable of reconciling democratic constitutionalism, economic governance, and the constraints imposed by an increasingly asymmetric international order.
