This article examines a phenomenon the author terms the “principle of international rudeness”. This “principle” is viewed as the antithesis of the principle of comitas gentium. The institutionalization of the principle of international rudeness takes the form of so-called “sanctions law”, which is generated by states in the Global North against developing countries and Russia in order to maintain ideological, political, and economic leadership in the global world order. Sanctions law has no basis in international law and cannot be justified morally or legally. Sanctions law, based on the principle of international rudeness, distorts all the fundamental institutions that underpin cross-border economic activity: property rights, contract law, liability, investor protection standards, and judicial protection of the rights of individuals and legal entities.