International Organisations and Resolutions as Sources of Law

International organisations play an important role in the development, interpretation and implementation of Public International Law. They provide institutional frameworks through which States cooperate, negotiate treaties, develop international standards and address matters of common concern. Resolutions adopted by international organisations, particularly the United Nations, may also influence the development and identification of international legal rules.

However, international organisations and their resolutions should not automatically be treated as independent primary sources of international law. Their legal significance depends upon the organisation’s constituent instrument, the nature of the resolution, the authority under which it was adopted, the language used and the circumstances surrounding its adoption.

Meaning of International Organisations

An international organisation is an entity established by an international agreement between States and possessing its own legal personality and institutional structure.

International organisations generally have:

• constituent instruments;
• permanent organs;
• defined functions and powers;
• institutional procedures;
• legal personality under applicable international law.

Examples include:

• United Nations;
• World Health Organization;
• International Labour Organization;
• World Trade Organization;
• International Civil Aviation Organization;
• International Maritime Organization.

International Organisations and International Law

International organisations contribute to international law in several ways.

They may:

• facilitate treaty-making;
• adopt legally binding decisions within their powers;
• develop international standards;
• provide forums for State practice;
• assist in the formation of customary international law;
• interpret and apply international legal rules;
• establish dispute-settlement mechanisms;
• coordinate international cooperation.

Their legal authority depends upon the powers granted to them by their constituent instruments and applicable international law.

Legal Personality of International Organisations

International organisations may possess an international legal personality separate from their member States.

This enables an organisation, within the scope of its legal capacity, to:

• enter into agreements;
• possess rights and obligations;
• bring or receive legal claims;
• exercise institutional powers;
• perform functions assigned by its constituent instrument.

The Reparation for Injuries Suffered in the Service of the United Nations advisory opinion is particularly important in this context.

The ICJ recognised that the United Nations possesses international personality and capacity necessary for the performance of its functions.

Powers of International Organisations

International organisations do not possess unlimited powers.

Their authority is derived primarily from their constituent instruments.

For example, an organisation’s powers may include:

• adopting resolutions;
• establishing subsidiary organs;
• administering programmes;
• coordinating policies;
• supervising implementation of international agreements;
• making recommendations;
• taking binding decisions where legally authorised.

The organisation must act within the scope of its legally conferred powers.

This is often described through the principle of attributed powers or principle of speciality.

International Organisations as Participants in Law-Making

International organisations can contribute to the development of international law without necessarily becoming a direct substitute for treaties or custom.

Their contribution may occur through:

Treaty-Making

International organisations frequently provide the institutional framework for negotiating and adopting multilateral treaties.

State Practice

Actions and positions expressed within international organisations may constitute evidence of State practice.

Opinio Juris

Statements made by States in international organisations may provide evidence of their belief concerning what international law requires.

Development of Legal Standards

Organisations may develop standards, guidelines and frameworks that influence State conduct and the evolution of international law.

Judicial and Advisory Mechanisms

Some international organisations establish courts, tribunals or other legal mechanisms that interpret and apply international law.

United Nations and International Law

The United Nations has a particularly important role in the development of international law.

The UN provides a forum where States:

• negotiate international agreements;
• discuss international legal principles;
• adopt resolutions;
• establish institutions;
• address international disputes;
• develop common standards.

The UN Charter itself is a treaty and therefore constitutes a formal source of international legal obligations for its parties.

UN General Assembly Resolutions

The General Assembly adopts resolutions on a wide range of international issues.

As a general rule, General Assembly resolutions are recommendations and are not binding on Member States merely because they have been adopted.

However, their legal significance should not be underestimated.

They may:

• provide evidence of opinio juris;
• contribute to the development of customary international law;
• clarify or articulate international legal principles;
• influence treaty development;
• demonstrate the position of the international community on particular issues.

The legal effect of a resolution therefore depends upon its content, context and circumstances.

UN Security Council Resolutions

Security Council resolutions require separate consideration because the Security Council possesses specific powers under the UN Charter.

Under Article 25 of the UN Charter, UN Members agree to accept and carry out the decisions of the Security Council in accordance with the Charter.

Certain Security Council decisions may therefore be legally binding on Member States.

The binding character depends upon:

• the legal basis of the resolution;
• the authority under which it was adopted;
• the language and context;
• the applicable provisions of the UN Charter.

Chapter VI and Chapter VII

The legal significance of Security Council action may depend upon the relevant chapter of the UN Charter.

Chapter VI

Chapter VI concerns the Pacific Settlement of Disputes.

The Security Council may make recommendations concerning peaceful settlement.

Chapter VII

Chapter VII concerns Action with Respect to Threats to the Peace, Breaches of the Peace, and Acts of Aggression.

The Security Council can adopt measures under Chapter VII, including binding decisions in appropriate circumstances.

General Assembly Resolutions vs Security Council Resolutions

Point	General Assembly Resolution	Security Council Resolution
General character	Usually recommendatory	May be binding
Legal basis	UN Charter provisions governing Assembly functions	UN Charter, particularly Articles 24 and 25
Binding effect	Generally not binding merely by adoption	Binding decisions may arise where legally authorised
Role in customary law	May provide evidence of opinio juris	May also contribute to State practice and legal development
Main function	Deliberation, recommendation and development of international standards	Maintenance of international peace and security

Resolutions as Evidence of Customary International Law

International organisation resolutions can be relevant to the identification and development of customary international law.

A resolution may provide evidence of:

• State practice;
• opinio juris;
• emerging legal principles;
• widespread acceptance of a particular legal position.

However:

A resolution does not automatically become customary international law merely because it receives a particular vote.

The existence of customary international law must still be assessed by examining the relevant State practice and opinio juris.

Voting Patterns and Opinio Juris

The way States vote on resolutions may provide evidence of their legal position.

For example, a State supporting a resolution declaring a particular principle to be legally required may provide evidence of opinio juris.

However, voting behaviour must be considered carefully.

A State may support a resolution for:

• political reasons;
• diplomatic reasons;
• policy considerations;
• compromise;
• reasons unrelated to the existence of a legal obligation.

Therefore, a vote alone does not necessarily establish opinio juris.

Declaratory Resolutions

Some international organisation resolutions seek to formulate or declare principles of international law.

The 1970 Declaration on Principles of International Law concerning Friendly Relations and Cooperation among States is an important example.

It addresses principles including:

• sovereign equality;
• prohibition of force;
• peaceful settlement;
• non-intervention;
• self-determination;
• international cooperation.

Such declarations may have significant legal influence, particularly where their principles reflect or contribute to customary international law.

Resolutions and Treaty Development

International organisation resolutions may contribute to the development of treaty law.

A resolution may:

• propose principles for future treaty negotiations;
• establish a negotiating framework;
• encourage States to conclude an agreement;
• formulate draft principles;
• initiate international legislative processes.

The resolution itself does not necessarily create the final treaty obligations.

Resolutions and Soft Law

Some resolutions are described as forms of soft law.

Soft law consists of instruments that may influence international conduct without necessarily creating legally binding obligations.

Examples may include:

• declarations;
• guidelines;
• principles;
• recommendations;
• policy frameworks.

Soft law can influence:

• State practice;
• treaty negotiations;
• interpretation;
• development of customary international law;
• international policy.

However, soft law should not automatically be equated with binding international law.

Law-Making Resolutions

The expression “law-making resolution” is sometimes used to describe resolutions that contribute significantly to the development or articulation of international legal rules.

A resolution may have law-making significance where:

• it reflects widespread State agreement;
• it expresses legal principles;
• it contributes to opinio juris;
• it is supported by consistent State practice;
• it influences subsequent treaties or customary rules.

Its legal effect must still be assessed rather than assumed.

International Organisations and Customary International Law

International organisations can contribute to the development of custom in several ways.

State Practice Within Organisations

States frequently express their positions through:

• votes;
• speeches;
• explanations of votes;
• declarations;
• negotiations;
• proposals.

These materials can provide evidence of State practice and opinio juris.

Organisational Practice

The conduct of an international organisation itself may also have legal significance within the scope of its institutional powers.

However, organisational practice should not automatically be treated as State practice.

International Organisations and General Principles

International organisations may contribute to the recognition and application of general principles of law.

Their institutional practice can help develop procedural and administrative principles concerning:

• fairness;
• accountability;
• due process;
• institutional responsibility;
• legal personality.

International Organisations and Judicial Decisions

International organisations may establish courts and tribunals whose decisions contribute to the interpretation and application of international law.

Examples include:

• International Court of Justice;
• International Tribunal for the Law of the Sea;
• International Criminal Court.

Their decisions operate according to the jurisdiction and legal framework governing each institution.

Important Cases

Reparation for Injuries Suffered in the Service of the United Nations, 1949

The ICJ considered whether the United Nations possessed international legal personality and the capacity to bring an international claim.

The Court recognised the international personality of the United Nations and affirmed that the organisation possessed powers necessary to perform its functions.

The case is fundamental to understanding the legal status and implied powers of international organisations.

Certain Expenses of the United Nations, 1962

The ICJ considered whether expenditures incurred by the United Nations constituted expenses of the Organisation under the UN Charter.

The opinion is important for understanding the powers and functions of the United Nations and the interpretation of its constituent instrument.

Namibia Advisory Opinion, 1971

The ICJ considered the legal consequences of Security Council Resolution 276 concerning Namibia.

The opinion is important for understanding the legal effects of Security Council decisions and the consequences of actions taken under the UN Charter.

Legal Consequences for States of the Continued Presence of South Africa in Namibia, 1971

The Court considered the legal consequences arising from the continued presence of South Africa in Namibia after relevant UN action.

The opinion illustrates the importance of Security Council resolutions and the legal framework governing UN action.

Nuclear Weapons Advisory Opinion, 1996

The ICJ considered relevant General Assembly resolutions and the development of international legal rules concerning nuclear weapons.

The opinion demonstrates that resolutions may be relevant evidence in determining the state of international law without automatically constituting binding law themselves.

International Organisations vs International Resolutions

These concepts should be distinguished.

International Organisation

An institutional entity created by States or other international legal arrangements.

Resolution

A formal decision, recommendation or declaration adopted by an organ of an international organisation.

An organisation may have legal personality, while an individual resolution may or may not possess binding legal effect.

Binding vs Non-Binding Resolutions

Type	General Legal Effect
General Assembly recommendation	Generally non-binding
General Assembly declaration	Generally non-binding by itself, but may have significant legal influence
Security Council binding decision	Binding where authorised under the Charter
Security Council recommendation	Generally recommendatory
Organisational administrative decision	May be binding within the organisation’s legal framework
Soft-law instrument	Generally non-binding but potentially influential

Limitations

International organisations and their resolutions have important limitations.

1. Limited Powers

An organisation can generally act only within the powers granted by its constituent instrument.

2. Not Every Resolution Is Binding

The legal effect depends upon the nature and authority of the resolution.

3. Political Considerations

Voting may reflect political compromise rather than a legal belief.

4. Resolution Does Not Automatically Equal Custom

A resolution may contribute to customary international law but does not automatically create it.

5. Organisational Practice Is Not Automatically State Practice

The conduct of an international organisation and the conduct of its member States must be distinguished.

Common Confusions

Are all UN resolutions legally binding?

No.

General Assembly resolutions are generally recommendatory, while certain Security Council decisions can be binding under the UN Charter.

Does a General Assembly resolution create international law automatically?

No.

It may provide evidence of opinio juris or contribute to the development of customary international law, but its legal effect must be assessed separately.

Are Security Council resolutions always binding?

No.

Their legal effect depends upon the relevant Charter provisions, the authority under which they were adopted and the nature of the decision.

Is every international organisation a source of international law?

Not exactly.

International organisations are participants and institutional mechanisms through which international law is created, interpreted and implemented. Their constituent instruments and authorised acts may have legal effects.

Is soft law the same as binding international law?

No.

Soft-law instruments generally lack the binding force of treaties or legally binding decisions, although they may influence the development of international law.

Can a resolution establish customary international law by itself?

No.

Custom requires the relevant State practice and opinio juris. A resolution may provide evidence of these elements.

Relationship with Other Sources

Treaties

International organisations frequently facilitate the negotiation and adoption of treaties.

Customary International Law

Resolutions and State conduct within international organisations may provide evidence of State practice and opinio juris.

General Principles

International organisations may develop institutional practices reflecting general legal principles.

Judicial Decisions

International courts and tribunals interpret the legal significance of resolutions and organisational acts.

Topic at a Glance

Point	Position
Subject	International Organisations and Resolutions
Main role	Institutional development and implementation of international law
Key UN provision	Article 25, UN Charter
General Assembly resolutions	Generally recommendatory
Security Council decisions	May be binding where authorised
Customary law	Resolutions may provide evidence of State practice or opinio juris
Soft law	Non-binding but potentially influential
Key principle	Organisations act within their legally conferred powers
Important case	Reparation for Injuries, 1949
Other cases	Certain Expenses, Namibia, Nuclear Weapons
Main limitation	Resolution does not automatically create binding international law

Quick Revision

• International organisations play an important role in the development and implementation of international law.
• Their powers generally derive from their constituent instruments.
• International organisations do not possess unlimited powers.
• The United Nations is the most important international organisation in the development of modern international law.
• General Assembly resolutions are generally recommendatory.
• Security Council decisions may be binding where authorised under the UN Charter.
• Article 25 of the UN Charter requires UN Members to accept and carry out Security Council decisions in accordance with the Charter.
• Resolutions may contribute to the development of customary international law.
• A resolution does not automatically create customary international law.
• Voting behaviour may provide evidence of opinio juris, but voting alone is insufficient.
• Some resolutions are considered forms of soft law.
• Declaratory resolutions may influence the development and articulation of international legal principles.
• International organisations can facilitate treaty-making and international cooperation.
• Reparation for Injuries, 1949 is important for the international legal personality of international organisations.
• Certain Expenses, 1962 concerns the powers and functions of the United Nations.
• Namibia, 1971 is important for the legal consequences of Security Council resolutions.
• Nuclear Weapons Advisory Opinion, 1996 demonstrates the relevance of General Assembly resolutions in determining international law.
• International organisation practice should not automatically be equated with State practice.
• The legal effect of a resolution depends upon its source, authority, wording, context and applicable legal framework.

Conclusion

International organisations and their resolutions occupy an important position in the modern international legal system. International organisations provide institutional frameworks through which States negotiate treaties, develop common standards, express legal positions and implement international obligations. Their resolutions can have different legal effects depending upon the organisation, the organ adopting the resolution and the authority under which it acts. While General Assembly resolutions are generally recommendatory, certain Security Council decisions may be binding under the UN Charter. Resolutions can also contribute to the development and identification of customary international law by providing evidence of State practice and opinio juris. However, a resolution does not automatically become binding international law merely because it has been adopted. Its legal significance must always be assessed in its proper context.