Cameron Miranda
Treaties and customary international law are both integral sources of international law. Customary international law consists of international legal obligations arising from established or usual international practices, which are less formal and often unwritten, as opposed to formal written treaties or conventions. Treaties can codify customary international law, as seen with the laws of war, which were customary law before being codified in the Hague Conventions of 1899 and 1907, the Geneva Conventions, and other treaties. While treaties and customary international law often work together, a question arises: can a treaty violate customary international law?
| Characteristics | Values |
|---|---|
| Definition | Customary international law consists of international legal obligations arising from established or usual international practices. |
| Sources | Treaties, decisions of national and international courts, national legislation, opinions of national legal advisors, diplomatic correspondence, and practice of international organizations. |
| Jus cogens | Customary international law and jus cogens are not interchangeable. All jus cogens are customary international law through adoption by states, but not all customary international laws are jus cogens. |
| Deviation | States can deviate from customary international law by enacting treaties and conflicting laws, but they cannot deviate from jus cogens. |
| Examples | Immunity of visiting foreign heads of state and the principle of non-refoulement. |
| United Nations | In 1993, the United Nations Security Council adopted the Geneva Conventions as customary international law. |
| Binding nature | If a treaty or law is considered customary international law, then parties that have not ratified the treaty will still be bound to observe its provisions in good faith. |
| Vienna Convention | A treaty is void if it conflicts with a peremptory norm of general international law (jus cogens) at the time of its conclusion. |
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What You'll Learn
Treaties conflicting with a peremptory norm of general international law
Treaties are an essential source of customary international law. However, a treaty is void if it conflicts with a peremptory norm of general international law, also known as jus cogens. Peremptory norms are norms accepted and recognized by the international community of states as a whole as a norm from which no derogation is permitted. In other words, they are non-derogable and can only be modified by a subsequent norm of general international law of the same character.
The number of peremptory norms is considered limited but not exclusively catalogued. They are not listed or defined by any authoritative body but arise out of case law and changing social and political attitudes. Generally, prohibitions on waging aggressive war, crimes against humanity, war crimes, maritime piracy, genocide, apartheid, slavery, and torture are included. For example, international tribunals have held that it is impermissible for a state to acquire territory through war.
The concept of peremptory norms is relatively new and seems to be at odds with the traditionally consensual nature of international law considered necessary for state sovereignty. Despite the seemingly clear weight of condemnation of certain practices, some critics disagree with the division of international legal norms into a hierarchy. There is also disagreement over how such norms are recognized or established, with some authors disputing the legal validity of the concept altogether.
Customary international law consists of international legal obligations arising from established or usual international practices, which are less formal customary expectations of behavior often unwritten, as opposed to formal written treaties or conventions. Custom is considered by the International Court of Justice, jurists, the United Nations, and its member states to be among the primary sources of international law. Many governments accept the existence of customary international law in principle, although there are differing opinions regarding the specific rules contained therein.
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Consent to be bound by a treaty
The Vienna Convention on the Law of Treaties defines a 'treaty' as an international agreement concluded between states and governed by international law. It is embodied in a single or multiple related instruments, regardless of its designation.
- The treaty states that the signature shall have that effect.
- It is established that the negotiating states agreed that the signature should have that effect.
- The intention of the state to give that effect to the signature is evident from the full powers of its representative or was expressed during the negotiation.
The initialling of a text constitutes a signature of the treaty when it is established that the negotiating states agreed. The consent of states to be bound by a treaty constituted by instruments exchanged between them is expressed by that exchange when the instruments establish the text of the treaty as its final form, and when the negotiating states agree.
The consent of a state to be bound by a treaty may also be expressed by:
- Exchange of instruments constituting a treaty.
- Ratification.
- Acceptance.
- Approval.
- Accession.
- Or by any other means if so agreed.
A state may not invalidate its consent to be bound by a treaty on the grounds that it was expressed in violation of its internal law, unless the violation was manifest and concerned a fundamental rule of its internal law. A violation is considered manifest if it would be objectively evident to any state conducting itself in accordance with normal practice and in good faith.
Additionally, a treaty is void if its conclusion has been procured by the threat or use of force in violation of the principles of international law embodied in the Charter of the United Nations. A treaty is also void if, at the time of its conclusion, it conflicts with a peremptory norm of general international law (jus cogens). Jus cogens are non-derogable, and while all jus cogens are customary international law, not all customary international laws are jus cogens.
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The conclusion of a treaty through threat or force
Coercion of a state or its representative through the threat or use of force to obtain consent for a treaty invalidates that consent. This is because consent obtained under duress is not considered a genuine expression of the state's will. The Japan-Korea treaties of 1905, 1907, and 1910, for instance, were protested by several governments as having been forced upon Korea by Japan and were subsequently deemed "null and void."
Customary international law, which includes treaties, plays a crucial role in shaping the international legal landscape. It consists of international legal obligations that arise from established or usual international practices, often unwritten, and is considered a primary source of international law by the International Court of Justice, jurists, the United Nations, and its member states. Customary international law is dynamic and evolves over time as new practices are established and recognized by the international community.
While customary international law guides the conduct of states, it is not static, and states can deviate from it by enacting treaties and conflicting laws. However, it is essential to distinguish between customary international law and jus cogens, which are peremptory norms that do not permit deviations. Jus cogens include universally accepted prohibitions against the aggressive use of force, genocide, crimes against humanity, piracy, racial discrimination, apartheid, slavery, and torture.
In conclusion, the conclusion of a treaty through threat or force is not only invalid under international law but also contradicts the principles of customary international law, which seeks to uphold the sovereign equality and independence of states. The use of coercion to obtain consent for a treaty invalidates that consent, rendering the treaty null and void. Treaties are meant to be concluded through diplomatic means, respecting the principles of international law and the will of sovereign states.
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Customary international law as a primary source of international law
Customary international law is a primary source of international law, alongside general principles of law and treaties. It is defined in Article 38(1)(b) of the International Court of Justice Statute as "a general practice accepted as law". This means that a significant number of states must engage in the practice, and they must do so out of a sense of legal obligation rather than custom or habit.
Customary international law consists of international legal obligations arising from established or usual international practices. These practices are less formal and often unwritten, as opposed to formal written treaties or conventions. Customary international law is not a written source, but it can be found in documentation such as state papers, diplomatic correspondence, national legislation, executive decisions, and judicial decisions of both national and international courts.
Customary international law is recognised by the International Court of Justice, jurists, the United Nations, and its member states. Many governments accept the existence of customary international law in principle, although there are differing opinions on the specific rules it contains. A rule becomes customary international law when two requirements are met. Firstly, there must be a state practice that is sufficiently widespread, representative, and consistent, showing that a significant number of states have used and relied on the rule. Secondly, states must be motivated by a belief that they are legally compelled to accept the rule because customary international law obligated them to do so (opinio juris).
Customary international law is dynamic and can change over time as international practices evolve. For example, the laws of war, or jus in bello, were once a matter of customary law before being codified in the Hague Conventions of 1899 and 1907, the Geneva Conventions, and other treaties. However, customary international law still governs legal matters concerning armed conflict that are not covered by these agreements.
While customary international law is a primary source of international law, it is important to note that states can deviate from it by enacting treaties and conflicting laws. However, they cannot deviate from peremptory norms (jus cogens) of general international law, which are accepted by the international community as non-derogable rights. Any treaty that conflicts with a peremptory norm is considered void.
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Customary international law and jus cogens
Customary international law consists of international legal obligations that arise from established or usual international practices. These are less formal customary expectations of behaviour, often unwritten, as opposed to formal written treaties or conventions. Custom is considered by the International Court of Justice, jurists, the United Nations, and its member states to be among the primary sources of international law. Customary international law can include treaties, decisions of national and international courts, national legislation, opinions of national legal advisors, diplomatic correspondence, and the practice of international organisations.
Jus cogens, or 'compelling law', refers to a category of norms that govern customary international law. Jus cogens are peremptory norms, and as the Latin term suggests, they are mandatory. They compel lawmakers to act in a specific manner. Jus cogens norms are universally accepted by the international community and are non-derogable. This means that states cannot deviate from them by enacting treaties and conflicting laws. Examples of jus cogens include the prohibition of crimes against humanity, genocide, slavery, and racial discrimination.
While all jus cogens are customary international law through their adoption by states, not all customary international laws rise to the level of peremptory norms. Some customary international laws have been codified through treaties and domestic laws, while others are recognised only as customary law. For instance, the laws of war, or jus in bello, were a matter of customary law before they were codified in the Hague Conventions of 1899 and 1907, the Geneva Conventions, and other treaties.
In summary, customary international law and jus cogens are distinct but interconnected concepts in international law. Customary international law encompasses a broad range of international practices and sources, while jus cogens refers specifically to a set of universally accepted, mandatory norms that govern customary international law.
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Frequently asked questions
Yes, states can deviate from customary international law by enacting treaties and conflicting laws.
Customary international law consists of international legal obligations that arise from established or usual international practices. These are less formal customary expectations of behavior and are often unwritten.
Examples include the immunity of visiting foreign heads of state and the principle of non-refoulement. The laws of war, also known as jus in bello, were also customary law before they were codified in the Hague Conventions of 1899 and 1907, the Geneva Conventions, and other treaties.
All jus cogens are customary international law through their adoption by states, but not all customary international laws rise to the level of peremptory norms (jus cogens). Jus cogens are non-derogable.
Yes, a treaty is void if, at the time of its conclusion, it conflicts with a peremptory norm of general international law.
