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UN Charter
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UN Charter

The 1945 founding treaty of the United Nations, prohibiting force and enshrining collective security.

On 29 July, Saudi jets struck Iraq after Riyadh invoked Article 51 of the UN Charter, extending the treaty’s self-defence language beyond the war’s original combatants.

Last refreshed: 22 September 2026 · Appears in 1 active topic

Key Question

Can the Charter's own depositary state be held accountable for violating it?

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Background

The UN Charter is the founding treaty of the United Nations. It sets out collective security, prohibits threats or uses of force against another state’s territorial Integrity or political independence, and preserves self-defence after an armed attack through Article 51. On 1 March, the Security Council’s emergency session on the Iran war showed how competing parties still use its provisions to argue the legality of force.

Its enforcement structure rests chiefly with the Security Council, where five permanent members hold vetoes, while the International Court of Justice is the United Nations’ principal judicial body. The Charter does not make every invocation of self-defence valid; it provides the common legal test against which such claims are made. Kuwait’s 28 May invocation of Article 51 illustrates that continuing practical role.

Key Issues
self defence claims

Article 51 widens self-defence claims

On 28 May, Kuwait invoked Article 51 after a missile was fired at Ali Al Salem Air Base. The move made the UN Charter’s self-defence clause the formal language of a Gulf response to the Iran war.

On 29 July, Saudi Arabia cited Article 51 when its jets struck Iraq. The two invocations show the Charter functioning as the common legal vocabulary for states seeking to frame military action as self-defence. They do not settle whether a claim meets the Charter’s threshold, but they make Article 51 central to how the conflict is argued.

UN legal claims

Qatar preserves a Charter claim

On 21 July, Qatar filed letters with the United Nations describing three Iranian attacks since 7 July, seeking compensation and reserving its right to self-defence under Article 51. The filing placed the UN Charter inside a live dispute without making it a basis for immediate military action.

As of 21 July, Qatar continued to host talks on reopening the strait of Hormuz while keeping its claim open. For the Charter, this showed its language serving diplomacy and legal notice as well as a claimed justification for force.

Common Questions
What is the UN Charter?
The UN Charter is the founding treaty of the United Nations, signed on 26 June 1945. It binds all 193 member states, prohibits the use of force against other states (Article 2(4)), and preserves the right of self-defence in response to an armed attack (Article 51). The Security Council is authorised under Chapter VII to approve collective use of force.Source: UN
Did the US violate the UN Charter by striking Iran?
Secretary-General Guterres and the governments of Russia and China stated that the US-Israeli strikes violated the Charter. The US disputed this, invoking Article 51 self-defence. No binding Security Council resolution was possible because the US holds a permanent veto.Source: UN Security Council
What is Article 51 of the UN Charter?
Article 51 preserves the inherent right of individual or collective self-defence if an armed attack occurs against a UN member state, until the Security Council has taken measures to maintain peace and security. The US invoked it to justify strikes on Iran; Saudi Arabia, the GCC, and the UAE all invoked it in response to Iranian strikes in 2026.Source: Pentagon
Why can the UN Charter not be enforced against a permanent Security Council member?
Chapter VII enforcement requires a Security Council resolution. Each of the five permanent members can veto any such resolution. When a P5 state is itself accused of a Charter violation, as the US is in the Iran conflict, the veto makes binding enforcement structurally impossible.Source: UN Security Council
What is the difference between the UN Charter and the Geneva Conventions?
The UN Charter governs when states may use force (jus ad bellum): it prohibits war except in self-defence or with Security Council authority. The Geneva Conventions govern how force is used once fighting begins (jus in bello): rules on prisoners, civilians, and the wounded. Both bodies of law apply simultaneously in the Iran conflict.Source: UN
What does the UN Charter have to do with the Falklands World Cup banner row?
The Charter's Article 1(2) enshrines peoples' right to self-determination. When Argentine fans displayed a Falklands banner at the 2026 World Cup, the UK Government reasserted Falkland Islanders' self-determination rights and called the banner an 'egregious violation' of FIFA rules, an example of the Charter's provisions surfacing well outside interstate warfare.Source: Lowdown
Source Material
United Nations CharterStatute of the International Court of JusticeCharter of the United Nations — WikipediaUN Charter — Full Text