Why This Matters
The United Nations was built on the ruins of the League with a precise awareness of what went wrong. The designers at San Francisco in 1945 knew the League's structural failures and made deliberate architectural choices to address them. They gave the great powers a veto to keep them inside the system rather than outside it. They gave the Security Council mandatory enforcement powers rather than voluntary ones. They created a near-universal membership to avoid the League's partial reach. Whether those choices worked is the central question of contemporary international law. The Security Council veto, designed to prevent the USA from leaving as it did with the League, has paralysed enforcement in virtually every major conflict since 1945. The tension between the design intent and the operational reality is what every examiner in this subject is testing.
Chapter Overview
This chapter answers four questions:
- How was the UN established and what are its purposes? The Charter framework.
- What are the principal organs? Their composition, powers, and relationship.
- How does the Security Council maintain peace? Chapter VI, Chapter VII, and the veto.
- How does the UN compare to the League? The structural improvements and remaining weaknesses.
Establishment and Purposes of the United Nations
The United Nations was established by the UN Charter, signed at San Francisco on 26 June 1945, and came into force on 24 October 1945.
The Charter is simultaneously a multilateral treaty binding on its parties and the constitutional instrument of the UN as an international organisation. It prevails over all other international treaties under Article 103: in the event of a conflict between obligations under the Charter and obligations under any other international agreement, the Charter obligations prevail.
The UN has 193 member states, making it the closest thing to a universal organisation in international law.
Purposes of the United Nations
Article 1 of the Charter sets out four purposes.
The first is to maintain international peace and security, and to that end to take effective collective measures for the prevention and removal of threats to peace, and for the suppression of acts of aggression.
The second is to develop friendly relations among nations based on respect for the principle of equal rights and self-determination of peoples.
The third is to achieve international cooperation in solving international problems of an economic, social, cultural, or humanitarian character, and in promoting respect for human rights.
The fourth is to be a centre for harmonising the actions of nations in the attainment of these common ends.
Principles of the United Nations
Article 2 of the Charter sets out the principles governing the UN and its members.
Sovereign equality of all members. Good faith fulfilment of Charter obligations. Peaceful settlement of disputes. Prohibition of threat or use of force against the territorial integrity or political independence of any state. Obligation to assist the UN in enforcement action. Non-interference in matters essentially within domestic jurisdiction. The domestic jurisdiction limitation in Article 2(7) is subject to Chapter VII: enforcement measures override it.
P eace and security: collective measures, suppression of aggression
S elf-determination: friendly relations among nations
G lobal cooperation: economic, social, cultural, humanitarian, human rights
P oint of harmony: centre for coordinating state action
Principal Organs of the United Nations
Article 7 of the Charter establishes six principal organs: the General Assembly, the Security Council, the Economic and Social Council (ECOSOC), the Trusteeship Council, the International Court of Justice, and the Secretariat.
The General Assembly
The General Assembly is the plenary organ of the UN, composed of all 193 member states, each with one vote.
The General Assembly has broad competence: it may discuss any question or matter within the scope of the Charter and may make recommendations to member states or the Security Council. Important questions require a two-thirds majority: admission of new members, suspension or expulsion, budgetary matters, and recommendations on peace and security. Other questions are decided by simple majority.
📋 Facts: During early Cold War deadlock, some members conditioned their vote for admitting new states on the simultaneous admission of other states favoured by their bloc.
⚖️ Issue: Whether a member voting on admission may impose conditions beyond those in Article 4(1) of the Charter.
🏛️ Held: It may not. The Article 4(1) criteria (statehood, peace-loving, acceptance of Charter obligations, ability and willingness to carry them out) are exhaustive. A member cannot make its consent depend on extraneous political conditions such as package-deal admissions.
🎯 Principle: Admission to the UN is governed by exhaustive legal criteria, not open-ended political bargaining. Charter provisions are subject to judicial interpretation like any treaty text.
🔗 Full case notes
The General Assembly cannot make binding decisions on member states in the way the Security Council can. Its resolutions are recommendations. However, consistent General Assembly resolutions on legal questions carry significant weight as evidence of opinio juris and the formation of customary international law.
The Uniting for Peace Resolution (1950): Where the Security Council fails to act due to lack of unanimity among the permanent members, the General Assembly may meet in emergency special session and consider the matter, making recommendations including the use of armed force. This resolution, adopted during the Korean War, was designed to bypass Security Council paralysis. Its legal status is contested but it has been invoked on multiple occasions.
📋 Facts: France and the USSR refused to pay their shares of the costs of UN peacekeeping operations in the Middle East (UNEF) and the Congo (ONUC), arguing the operations were unconstitutionally established because peacekeeping appears nowhere in the Charter.
⚖️ Issue: Whether peacekeeping expenditures were "expenses of the Organization" under Article 17(2) that all members must bear.
🏛️ Held: They were. Action in fulfilment of one of the UN’s purposes is presumed intra vires. Peacekeeping authorised by the General Assembly or Security Council serves the purpose of maintaining peace, and its costs are apportionable expenses binding on all members.
🎯 Principle: The implied powers doctrine applied to the UN budget: peacekeeping is lawful though unnamed in the Charter, and members cannot withhold contributions from operations they politically oppose.
🔗 Full case notes
The Security Council
The Security Council has primary responsibility for the maintenance of international peace and security under Article 24 of the Charter.
The Security Council has 15 members: 5 permanent members (P5: USA, UK, France, Russia, China) and 10 non-permanent members elected by the General Assembly for two-year terms. Decisions on procedural matters require 9 votes. Decisions on substantive matters require 9 votes including the concurring votes of all five permanent members.
The veto: Each permanent member has the power to veto any substantive decision. Abstention by a permanent member does not constitute a veto: the practice of constructive abstention allows P5 members to avoid blocking action without endorsing it.
The veto was a deliberate design choice at San Francisco. The great powers, having seen the USA stay out of the League, insisted on the veto as the price of joining. Without the veto the UN would have been created without the USA and USSR, repeating the League's fatal flaw. With the veto, the great powers remain inside the system but can block enforcement against themselves or their allies.
Chapter VI: Pacific Settlement of Disputes
Chapter VI of the Charter deals with the peaceful settlement of disputes. Article 33 requires parties to a dispute whose continuance is likely to endanger peace to seek solution through negotiation, enquiry, mediation, conciliation, arbitration, judicial settlement, or other peaceful means. The Security Council may call upon parties to settle disputes by peaceful means and may investigate any dispute to determine whether it is likely to endanger peace.
Chapter VI powers produce recommendations, not binding decisions. The Security Council cannot compel states under Chapter VI.
Chapter VII: Action with Respect to Threats to Peace
Chapter VII is the enforcement engine of the UN system. It is triggered when the Security Council determines the existence of a threat to peace, breach of peace, or act of aggression under Article 39.
Article 40: The Security Council may call upon the parties to comply with provisional measures before making a Chapter VII determination, to prevent aggravation of the situation.
Article 41: The Security Council may decide on measures not involving the use of armed force: complete or partial interruption of economic relations, rail, sea, air, postal, telegraphic, radio communications, and the severance of diplomatic relations. These decisions are binding on all UN members under Article 25.
Article 42: If Article 41 measures are inadequate, the Security Council may take action by air, sea, or land forces necessary to maintain or restore international peace and security. Members are obligated to make armed forces available under Article 43 agreements, though no such agreements have ever been concluded.
Chapter VII decisions are binding on all member states. This is the critical difference from the League: the Security Council under Chapter VII does not need unanimous consent and its decisions are not voluntary. Any state that fails to comply with a binding Security Council resolution is in breach of its Charter obligations.
| Dimension | Chapter VI | Chapter VII |
|---|---|---|
| Trigger | Dispute likely to endanger peace | Threat to peace, breach of peace, or act of aggression |
| Powers | Investigation, recommendations, call for peaceful settlement | Binding decisions: sanctions (Article 41), armed force (Article 42) |
| Binding effect | Recommendations only | Binding on all UN members under Article 25 |
| Consent required | Parties' cooperation needed | No: overrides domestic jurisdiction (Article 2(7)) |
| Example | Security Council mediation in Kashmir | Chapter VII sanctions on Iraq, Resolution 678 (Gulf War) |
ECOSOC, Trusteeship Council, and Secretariat
ECOSOC coordinates the economic and social work of the UN and its specialised agencies. It has 54 members elected by the General Assembly. It makes recommendations on economic, social, cultural, educational, and health matters, and coordinates the activities of the UN specialised agencies.
The Trusteeship Council administered the UN Trust Territories, largely the former mandates of the League and former colonial territories placed under UN supervision. It suspended operations in 1994 when Palau, the last trust territory, became independent.
The Secretariat is headed by the Secretary-General, the chief administrative officer of the UN. The Secretary-General may bring to the attention of the Security Council any matter that appears to threaten international peace and security (Article 99). The Secretary-General plays a significant diplomatic role in conflict prevention and resolution.
The UN and Collective Security: League vs UN
The UN corrected the League's four structural failures but introduced new problems of its own.
The unanimity paralysis of the League's Council was replaced by the veto system: only five states can block, not every member. Chapter VII mandatory enforcement replaced voluntary sanctions. Near-universal membership replaced partial participation. The absence of a standing army remains, but Article 43 agreements were intended to provide one.
The veto however reproduced the core problem at a smaller scale. The P5 cannot be subjected to enforcement action because each can veto it. Cold War rivalry between the USA and USSR paralysed the Security Council for four decades. Post-Cold War, the Council became more active (Gulf War 1990, Somalia, Rwanda, Bosnia) but P5 tensions over Syria, Ukraine, and Gaza have again exposed the veto as a structural block on collective security where great power interests are engaged.
| Dimension | League of Nations | United Nations |
|---|---|---|
| Founding | Treaty of Versailles, 1919 | UN Charter, San Francisco, 1945 |
| Membership | 58 at peak; USA never joined | 193 members; near-universal |
| Enforcement | Voluntary sanctions; unanimity required | Chapter VII binding; Security Council veto |
| Decision rule | Unanimity: Assembly and Council | Majority: Assembly; 9 plus P5 concurrence: Council |
| Standing forces | None; no mechanism | None; Article 43 agreements never concluded |
| Judicial arm | PCIJ (separate statute) | ICJ (principal organ under Charter) |
| Fate | Dissolved April 1946 | Active: 193 members |
Common Confusions
General Assembly resolutions are recommendations, not binding decisions. The Security Council alone has the power to take binding decisions under Chapter VII. The Uniting for Peace Resolution allows the General Assembly to recommend action when the Security Council is blocked, but those recommendations remain non-binding.
Abstention by a permanent member does not constitute a veto. The Charter requires the concurring votes of all permanent members, but the practice of constructive abstention is well established: a P5 member that abstains does not block the resolution. Only an express negative vote is a veto.
Chapter VII has two tiers. Article 41 covers non-military measures: economic sanctions, severance of diplomatic relations, communications blockades. Military measures under Article 42 are used only if the Security Council considers Article 41 measures inadequate. Most Chapter VII action involves sanctions, not armed force.
Key Takeaways
UN Charter: signed 1945, 193 members, Article 103 supremacy. Four purposes: PSGP. Six principal organs.
General Assembly: all members, one vote. Recommendations only. Uniting for Peace: bypass SC paralysis. Evidence of opinio juris.
Security Council: 15 members, P5 veto. Chapter VI: recommendations. Chapter VII: binding decisions, sanctions (Article 41), armed force (Article 42). Article 25: all members bound by SC decisions.
League vs UN: unanimity replaced by veto; voluntary replaced by binding; partial membership replaced by near-universal. Veto still blocks enforcement where P5 interests are engaged.
Memory Hooks: PSGP: four UN purposes Chapter VI vs Chapter VII table League vs United Nations table
Security Council
The Security Council is the principal organ of the United Nations with primary responsibility for the maintenance of international peace and security under Article 24 of the UN Charter. It has 15 members: five permanent members (USA, UK, France, Russia, and China) and ten non-permanent members elected by the General Assembly for two-year terms.
Decisions on substantive matters require nine affirmative votes including the concurring votes of all five permanent members. Each permanent member holds a veto: an express negative vote by any P5 member defeats any substantive resolution. Abstention does not constitute a veto.
The Security Council operates under two enforcement chapters. Chapter VI provides for the peaceful settlement of disputes through recommendations and investigation. Chapter VII empowers the Council to determine the existence of a threat to peace, breach of peace, or act of aggression, and to take binding decisions including economic sanctions under Article 41 and military action under Article 42. Chapter VII decisions bind all UN member states under Article 25, overriding the domestic jurisdiction limitation in Article 2(7).
Part B (15 marks)
Discuss the Structure, Powers and Functions of the United Nations / Security Council / General Assembly / UN Charter
- UN Charter 1945: founding instrument; Article 1 purposes, Article 2 principles
- Six principal organs: General Assembly, Security Council, ECOSOC, Trusteeship Council, ICJ, Secretariat
- General Assembly: 193 members, one vote each, recommendations only (Articles 9-22)
- Security Council: 15 members (5 permanent + 10 elected), P5 veto (Article 27); Chapter VI peaceful settlement; Chapter VII binding enforcement
- P5: USA, UK, France, Russia, China; Article 27(3) requires "concurring votes of permanent members"
- Article 41: economic sanctions; Article 42: military force; Article 51: self-defence
- Uniting for Peace Resolution 1950: GA may recommend action when SC blocked
- Article 99: Secretary-General may bring threats to peace before SC; political independence