Jus cogens constitutes the irreducible core of peremptory norms of Public International Law, endowed with a superior hierarchy and mandatory character, whose purpose is to safeguard the fundamental values of the international community, preventing any derogation through treaties or unilateral acts of States.
Concept and Foundation
The concept of jus cogens, or peremptory law, reflects the transition of an international legal system based strictly on state consent to a model founded on non-negotiable universal values. Legally, jus cogens is characterized by its nature as international public order (ordre public international), possessing erga omnes efficacy and a peremptory character, which implies the absolute nullity of any conventional norm that contradicts it.
The legal nature of the institute lies in its hierarchical supremacy. Unlike dispositive norms (jus dispositivum), which allow for flexibility through agreement between parties, jus cogens norms impose themselves as insurmountable limits to the autonomy of the will of States, integrating the ethical-legal heritage of humanity.
Historical Origin and Evolution
The formal codification of the institute occurred with the 1969 Vienna Convention on the Law of Treaties. However, the doctrinal root dates back to Roman Law, with the maxim jus publicum privatorum pactis mutari non potest. In the 20th century, under the aegis of the 1945 United Nations Charter and the subsequent need to avoid the repetition of the atrocities of the war period, internationalist doctrine consolidated the idea that certain norms — such as the prohibition of torture, slavery, and genocide — should be immune to the will of States.
Legal and Normative Provision
The positivation of jus cogens is found, primarily, in Article 53 of the Vienna Convention on the Law of Treaties (1969), which establishes:
"A treaty is void if, at the time of its conclusion, it conflicts with a peremptory norm of general international law."
In the Brazilian legal system, although there is no literal mention of the term "jus cogens" in the 1988 Federal Constitution, the reception of these precepts occurs via Article 5, § 2, which deals with the opening of the system to fundamental rights, and Article 4, which defines the guiding principles of the international relations of the Federative Republic of Brazil, notably the prevalence of human rights (item II).
Practical Application and Jurisprudence
The Supreme Federal Court (STF) has recognized, in several rulings, the primacy of jus cogens norms, especially in the context of extradition and human rights. The consolidated jurisprudence, notably in the analysis of habeas corpus and ADPF, reinforces that jus cogens norms possess a supralegal hierarchy, approaching parity with the constitutional block.
Recent decisions by the STF, such as those dealing with the imprescriptibility of crimes against humanity and the prohibition of regression in fundamental rights, demonstrate the integration of jus cogens as a parameter for conventionality control. The Court reaffirms that international treaties dealing with human rights, when ratified, are incorporated into the system with supralegal status, and the core of these norms constitutes jus cogens.
Related Principles and Divergences
The contemporary doctrinal debate centers on the exhaustive identification of the norms that make up the list of jus cogens. The UN International Law Commission (ILC), in its recent reports, has attempted to delimit this catalog, including the prohibition of aggression, the right to self-determination of peoples, and the prohibition of racial discrimination. The divergence lies in the tension between state sovereignty (positivist perspective) and the supremacy of universal values (contemporary natural law perspective).
Contemporary Relevance
In the current scenario, jus cogens acts as a brake on the fragmentation of International Law. It directly impacts the conventionality control of national laws, preventing internal legislation from legitimizing practices that violate the core of human rights. Practical relevance is verified in the international responsibility of States and in universal jurisdiction for crimes against humanity, where the claim of sovereignty is ineffective to exclude the application of these peremptory norms.
Legal and Jurisprudential References
- Vienna Convention on the Law of Treaties (1969), Articles 53 and 64.
- Constitution of the Federative Republic of Brazil of 1988, Articles 4 and 5.
- Supreme Federal Court: RE 466.343 (supralegal status of human rights treaties).
- UN International Law Commission: Reports on peremptory norms of general international law (jus cogens), 2022.
- Rome Statute of the International Criminal Court (reference regarding the peremptory nature of crimes against humanity).
