The United Nations Security Council meets in New York. Photo by UN Photo/Manuel Elias.
The United Nations Security Council is the UN organ with primary responsibility for international peace and security. The Council can authorize peace operations and impose sanctions. It can create subsidiary bodies, refer situations to international justice mechanisms and adopt binding decisions under the UN Charter. Its authority is unusually strong for an international organization. Its legitimacy, however, is constantly contested since five permanent members hold veto power: China, France, Russia, the United Kingdom and the United States.
The Council’s design reflects the politics of 1945. The Security Council was built after the failure of the League of Nations and after a world war in which the victorious great powers would not accept a security institution that could routinely act against them. As a result, the Council combines a universal legal language with a selective power structure. The institution claims to act for the international community, but its most powerful members can block decisions even when a large majority supports action.
Summary
- The Security Council has 15 members: five permanent members and ten elected non-permanent members.
- Its central mandate is the maintenance of international peace and security.
- For procedural votes, nine affirmative votes are enough.
- For substantive votes, a draft normally needs nine affirmative votes and no veto from a permanent member.
- A permanent member can abstain without blocking a resolution.
- The veto protects the great-power bargain behind the UN, while creating accusations of selectivity and impunity.
- Reform debates usually focus on membership, representation, the veto, working methods, and the relationship between the Council and the General Assembly.
- Reform is difficult since Charter amendment requires ratification by all permanent members.
What the Security Council Does
The Security Council turns the UN’s peace-and-security mandate into a smaller body with binding authority. The UN Charter gives it “primary responsibility” for maintaining international peace and security. The Charter mandate covers wars, threats to peace and major crises. The same mandate gives the Council a central role in sanctions, peacekeeping mandates and disputes that may endanger international stability.
In practice, the Council does several different kinds of work. The Council debates crises and requests reports from the Secretary-General. The Council renews mission mandates, imposes sanctions and adopts resolutions that can become binding on UN member states. In addition, it creates committees and working groups. Those subsidiary bodies monitor sanctions, counterterrorism, non-proliferation, children in armed conflict and other agenda items.
The Council’s authority differs from the General Assembly’s authority. The General Assembly is universal: all UN member states have one vote. The Assembly can recommend and debate. It approves budgets, elects officials and expresses political positions. Most General Assembly resolutions remain recommendations, while Security Council decisions can bind member states. The Council is smaller, less representative and more powerful. The combination of concentrated membership and binding authority is the source of both its effectiveness and its political crisis.
The Council works continuously from a permanent institutional base in New York. Its presidency rotates monthly among members. Its programme of work changes with crises, mandate renewals, and member priorities. Owing to this continuous structure, states often use it as a diplomatic stage even when they know that a binding outcome is unlikely.
Membership and Representation
Since the Charter amendment that entered into force in 1965, the Security Council has had 15 members: five permanent members and ten elected members. China, France, Russia, the United Kingdom and the United States hold the five permanent seats. The ten non-permanent members are elected by the General Assembly for two-year terms, with seats distributed by regional groups.
The UN reported in June 2025 that Bahrain, Colombia, the Democratic Republic of the Congo, Latvia and Liberia were elected for terms beginning in January 2026. They serve in 2026 alongside Denmark, Greece, Pakistan, Panama and Somalia:
- Bahrain
- Colombia
- Democratic Republic of the Congo
- Denmark
- Greece
- Latvia
- Liberia
- Pakistan
- Panama
- Somalia
The permanent seats came from the power settlement at the end of the Second World War. The United States, the Soviet Union, the United Kingdom, China and France were treated as essential powers for any collective security system that hoped to survive. Russia later continued the Soviet seat. The permanent members were not chosen as representatives of every region or population group. The group did not represent every legal tradition or later distribution of economic power either. The seats went to those powers because the UN was designed around the consent of the wartime great powers.
The 1945 settlement helps explain why representation remains a recurring focus of reform debates. No country in Africa, Latin America, South Asia or the Arab world has a permanent seat. Japan and Germany, which became major economic powers after 1945, remain outside permanent membership. Many states argue that a Council created for the world of 1945 cannot claim full legitimacy in a UN with 193 members and a much wider distribution of population, wealth, and diplomatic influence.
Non-permanent membership partly corrects this imbalance. Elected members can chair committees and shape negotiations. They can also call attention to regional concerns and build coalitions around specific files. However, they serve only two years and do not possess veto power. Their influence depends on timing, expertise and diplomatic skill. Their room for maneuver also depends on whether the permanent members are divided or willing to compromise.
How Voting Works
Article 27 of the UN Charter sets the basic voting rule: each Security Council member has one vote. Procedural decisions require nine affirmative votes, while substantive decisions require nine affirmative votes and no veto by a permanent member. A substantive resolution can therefore fail either because it lacks a majority or because a permanent member blocks it.
The rule distinguishes opposition, abstention and direct blockage. A negative vote by a permanent member on a substantive question is treated as a veto. An abstention, by contrast, does not block adoption if the draft receives nine affirmative votes. In practice, abstention allows the Council to adopt a decision when a permanent member has reservations but does not want to block the outcome.
The difference between procedure and substance also matters because procedural decisions cannot be vetoed. Even so, the boundary between the two categories can be politically contested: for example, agenda control, meeting formats, invitations and fact-finding arrangements influence how the Council works.
Why the Veto Exists
The veto exists as the result of a great-power bargain in the UN Charter. The designers of the United Nations wanted an organization stronger than the League of Nations, but they understood that a security body acting directly against the major military powers could collapse or be ignored. The veto made participation acceptable to the states whose cooperation was considered essential for enforcement.
The veto bargain had a hard political logic. If the United States, the Soviet Union, or another permanent member had believed that the Council could authorize coercive action against it or its core allies by simple majority vote, it might have refused to join or might have left once the first crisis appeared. The veto therefore helped keep the strongest states inside the institution.
The cost is selectivity. When permanent members agree, the Council can act with unusual authority. When they disagree, the Council may be blocked even during large wars, humanitarian disasters or blatant violations of international law. During the Cold War, rivalry between the United States and the Soviet Union repeatedly limited collective security. After the Cold War, cooperation sometimes increased. Later divisions over Iraq, Syria, Ukraine and Gaza showed that permanent-member rivalry still limits collective security.
The veto is therefore both a stabilizer and a source of paralysis. The veto stabilizes the UN by preventing the institution from becoming a routine instrument against great powers. The veto paralyzes the UN when those same powers use it to protect themselves or their allies. The same privilege can shield client states and strategic positions from collective action as well.
Legitimacy and Selectivity
Security Council legitimacy has several layers. Legal legitimacy comes from the UN Charter: member states accepted a treaty that gives the Council special responsibility and powers. Procedural legitimacy depends on whether the Council follows its own rules and hears affected states. Procedural legitimacy also depends on whether the Council explains decisions and applies standards consistently. Political legitimacy depends on whether states and publics believe that the Council’s composition and outcomes reflect the world it claims to govern.
The veto strains all three layers. Legally, it is part of the Charter. Politically, it looks unequal since five states possess a privilege denied to all others. Procedurally, it can make similar crises produce different outcomes. One conflict may receive sanctions, a peacekeeping mandate, or a referral to accountability mechanisms. Another may receive only debate when a permanent member blocks action.
Council selectivity does not make it useless. Even when the Council cannot solve a crisis, it can create records and force public positions. Where agreement exists, the Council can authorize humanitarian mechanisms, renew technical mandates, support peace operations and coordinate sanctions. It gives non-permanent members and affected states a diplomatic arena in which to expose contradictions as well.
Meetings, mandates and sanctions do not by themselves settle the legitimacy problem. A Council that acts on some crises and remains blocked on others can appear to enforce power rather than law. That perception is especially clear when vetoes protect a permanent member’s own conduct or the conduct of a close ally. For many states, the core problem is the veto’s gatekeeping effect, since a small group decides when international peace and security will be treated as a collective problem.
Reform Proposals
Reforming the Council means deciding who enters the room, who can block decisions, and how much leverage the wider UN membership has over the body. During the General Assembly’s eightieth session, the official reform track continued intergovernmental negotiations on equitable representation and increased membership. The debate also covers the veto, working methods and ways to make the Council more accountable to other member states, while a comprehensive settlement remains out of reach.
Reform proposals usually follow five main routes:
- Expansion of permanent seats: adding states such as Brazil, Germany, India, Japan, or African representatives as permanent members.
- Expansion of elected seats: increasing the number of non-permanent members while preserving the existing permanent category.
- Longer-term elected seats: creating a new category of members elected for longer or renewable terms.
- Veto restraint: limiting veto use in cases involving mass atrocities, genocide, or a permanent member’s own conduct.
- Working-method reform: increasing transparency, consultations with affected states, penholder diversity, and accountability to the General Assembly.
Each model solves one problem while creating another. Adding permanent seats may improve representation, but it can make the Council larger and harder to coordinate. Adding elected seats improves participation, but it leaves the veto untouched. Restricting the veto could reduce paralysis in severe crises, but permanent members have little incentive to weaken their own privilege. Working-method reforms are easier to adopt. Procedural reforms improve Council practice without changing the basic distribution of power.
Why Reform Is Difficult
The main obstacle to formal Council reform is the Charter amendment rule. Reforming the Council’s composition or the veto would require broad UN support and ratification by all five permanent members. In effect, the veto protects the system that created the veto.
States disagree among themselves as well. Some support new permanent seats for major regional powers. Others fear that adding permanent members would create new inequalities in their own regions. African states have demanded stronger representation, but the exact allocation of seats and veto rights remains politically difficult. Smaller and medium-sized states often prefer elected or longer-term seats because those models avoid creating another closed club.
Among UN members, there is also disagreement over what would make the Council legitimate. For some states, legitimacy means ensuring that the body has regional and demographic balance. For others, it means ensuring that the Council can still make effective decisions. A third group focuses on limiting the veto, making sanctions more accountable or ensuring that the Council listens to states affected by its decisions. These reform goals can conflict. A larger Council may be more representative but slower. A smaller Council may act faster but appear less legitimate.
For this reason, reform advances more often through working methods than through Charter change. The Council can hold more open debates and involve civil society. The Council can improve sanctions procedures, invite briefers, publish more information and share penholder roles. Working-method changes improve transparency without answering the central political question: who has the right to block collective action?
Conclusion
The UN Security Council is powerful because it links international law, diplomatic authority and great-power consent. Security Council resolutions can bind states. Council decisions can shape the handling of war, sanctions, peacekeeping and international security crises as well. At the same time, its structure preserves the hierarchy of 1945. Five permanent members hold a veto that can prevent action even when most of the Council and much of the wider UN membership favor it.
The veto keeps major powers inside the UN system while allowing them to make collective action selective. Reform could make the Council more representative, transparent, or restrained, but the deepest reforms require consent from the states that benefit most from the current rules. The Security Council remains relevant because no other UN body has the same authority. It remains contested, however, because that authority is exercised unequally through great-power politics.