The Security Council — Public International Law Notes

The Security Council

Every other UN organ can only recommend. The Security Council can command. When it declares under Chapter VII that a situation threatens the peace, its decisions bind all 193 members — they must comply. That is a power no other body in international law possesses. But it comes with a catch that shapes world politics: five States — China, France, Russia, the United Kingdom and the United States — hold a permanent seat and a veto, and a single one of them can stop the Council dead. The Council is the sharpest instrument in the Charter and the one the examiner asks about most.

What the Security Council is, its composition, powers and the veto

The Security Council (SC) is the UN’s executive organ for international peace and security. Where the General Assembly deliberates, the Council acts — it is small, it sits in permanent session, and, uniquely, its decisions bind. Learn it in four parts: composition, powers, voting, and the veto.

A. Composition (Article 23)

The Council has fifteen members:

Five permanent members (“the P5”) — China, France, Russia (successor to the USSR), the United Kingdom and the United States.
Ten non-permanent members, elected by the General Assembly for two-year terms (five replaced each year), with due regard to geographical distribution and contribution to the maintenance of peace. A retiring member is not immediately re-eligible.

B. Powers and functions

Pacific settlement of disputes (Chapter VI) — the Council may investigate any dispute, and recommend appropriate procedures or terms of settlement (Arts. 33–38).
Enforcement action (Chapter VII) — this is its unique power. On determining the existence of a threat to the peace, breach of the peace or act of aggression (Art. 39), it may:
- decide measures not involving armed force — economic sanctions, severance of relations, blockade (Art. 41); and
- if those are inadequate, take action by air, sea or land forces (Art. 42).
Binding force (Art. 25) — members “agree to accept and carry out the decisions of the Security Council” — the Council is the only organ whose decisions bind.
Other roles — it recommends admission, suspension and expulsion of members to the GA; recommends the appointment of the Secretary-General; and, with the GA, elects the ICJ judges.

C. Voting (Article 27) and the veto

Each member has one vote, but the type of question changes the majority needed:

Procedural matters — decided by an affirmative vote of any nine of the fifteen members.
All other (substantive) matters — decided by an affirmative vote of nine members including the concurring votes of the five permanent members.

That second rule is the veto: a single negative vote by any one of the P5 defeats a substantive resolution, even if the other fourteen vote in favour. Two refinements the examiner rewards:

Abstention is not a veto. In consistent practice (accepted by the ICJ in the Namibia opinion, 1971), a permanent member’s abstention or absence does not block a resolution — only a negative vote does.
The “double veto”. The question whether a matter is procedural or substantive is itself a substantive question, so a permanent member can veto the characterisation first, then veto the substance.

⚠️ Do NOT write that “nine votes always carry a Security Council decision”. Nine votes carry only a procedural matter. A substantive decision needs nine votes AND the absence of a veto by any permanent member — that is the whole point of Art. 27(3).

Article 27(2)–(3), UN Charter (1945): “Decisions of the Security Council on procedural matters shall be made by an affirmative vote of nine members. Decisions of the Security Council on all other matters shall be made by an affirmative vote of nine members including the concurring votes of the permanent members…”

Article 25, UN Charter (1945): “The Members of the United Nations agree to accept and carry out the decisions of the Security Council in accordance with the present Charter.”

In Simple Terms: The Security Council is the UN’s action arm — fifteen members, five of them permanent with a veto. It can do something no one else can: under Chapter VII it can brand a situation a threat to peace and then order sanctions (Art. 41) or even military force (Art. 42), and every member must obey (Art. 25). But on any real decision, all five permanent members must at least not object — one “no” from China, France, Russia, the UK or the USA kills the resolution. An abstention, though, is not a veto.

🧩 WORKED EXAMPLE — 14 in favour, one permanent “no”

Facts. A draft resolution imposing economic sanctions on State Z secures the affirmative votes of fourteen of the fifteen Council members. One permanent member votes against it.

Rule. Sanctions under Art. 41 are a substantive matter, requiring nine affirmative votes including the concurring votes of all five permanent members (Art. 27(3)). A negative vote by any permanent member is a veto.

Apply. The decoy is the crushing 14-to-1 majority — it looks certain to pass. But the lone negative vote is cast by a permanent member, so the concurrence required by Art. 27(3) is missing. (Contrast: had that member abstained, the resolution would pass — abstention is not a veto, per Namibia, 1971.)

Conclusion. The resolution fails; the sanctions cannot be imposed. The veto, not the arithmetic, decides.

flowchart TD
    A["Security Council<br/>(15 members — Art. 23)"]
    A --> B["5 permanent (P5): China, France,<br/>Russia, UK, USA — hold the VETO"]
    A --> C["10 non-permanent: elected by GA,<br/>2-year terms"]
    A --> D["Pacific settlement (Ch. VI) — recommend"]
    A --> E["Enforcement (Ch. VII): threat to peace (Art. 39)<br/>-> sanctions (Art. 41) -> force (Art. 42)"]
    A --> F["Decisions BIND all members (Art. 25)"]
    A --> G["Voting (Art. 27): procedural = 9;<br/>substantive = 9 incl. all P5;<br/>abstention is NOT a veto"]
    classDef box fill:#e8f0fe,stroke:#333,color:#111;
    class A,B,C,D,E,F,G box;

Case Laws

Legal Consequences for States of the Continued Presence of South Africa in Namibia (1971, ICJ, Advisory Opinion) — a voluntary abstention by a permanent member does not prevent adoption of a Security Council resolution; the Council’s binding decisions under Art. 25 are not confined to Chapter VII.
Certain Expenses of the United Nations (1962, ICJ, Advisory Opinion) — while the SC has primary responsibility for peace and security, that responsibility is primary, not exclusive; the GA may also act.

📄 Full notes + Question Bank (₹199) — every topic in depth, model answers to all past KSLU questions, in one printable PDF. Get the bundle · 10 Solved Problems · All Public International Law topics