Jus Cogens, Erga Omnes, and Peremptory Norms in International Law
Jus cogens and obligations erga omnes occupy a distinctive place in international law because they mark the point at which the legal order recognizes certain norms as fundamental, non-derogable, and binding in the name of the international community as a whole. This article examines the distinction and relationship between peremptory norms and community-wide obligations through the Vienna Convention on the Law of Treaties, Barcelona Traction, Belgium v. Senegal, the International Law Commission’s 2022 jus cogens conclusions, and the legal consequences of treaty invalidity, non-recognition, non-assistance, and collective legal interest. It also explores how apartheid, colonial domination, Palestine, and the unequal enforcement of foundational norms reveal both the anti-imperial promise and the practical limits of international law’s highest normative claims.









