Did the 1960 Treaty of Guarantee Allow Intervention in 1974? Article IV Read Line by Line

Why It Matters

Article IV of the 1960 Treaty of Guarantee is the clause on which the legality of the 20 July 1974 operation in Cyprus turns. It obliges Greece, Türkiye and the United Kingdom to consult, expects common action where possible, and otherwise reserves to each guarantor the right to act “with the sole aim of re-establishing the state of affairs created by the present Treaty.” The dispute is therefore not whether the clause exists but what “action” it permits, and for how long.

Background

The treaty framework

The Treaty of Guarantee was signed in Nicosia on 16 August 1960 by the Republic of Cyprus, Greece, Türkiye and the United Kingdom. It came with the Treaty of Establishment and the Treaty of Alliance, and followed the 1959 Zurich and London agreements. For the wider design, see Cyprus Treaty Architecture: Zurich and London 1959, the 1960 Guarantee and the Road to Sovereign Equality.

• Article I: Cyprus undertakes to maintain its independence, territorial integrity and security. It undertakes not to take part in any political or economic union with any State, and it prohibits activity promoting either union with another State or partition of the island.
• Article II: the three guarantors recognise and guarantee that independence, territorial integrity and security, “and also the state of affairs established by the Basic Articles of its Constitution.” They undertake to prohibit, so far as concerns them, any activity promoting union or partition.
• Treaty of Alliance: it provided for national military contingents on the island, commonly cited as 950 Greek and 650 Turkish personnel.

Article IV read line by line

The English text of Article IV reads, in substance: in the event of a breach of the provisions of the Treaty, Greece, Türkiye and the United Kingdom undertake to consult together on the representations or measures necessary to ensure observance; in so far as common or concerted action may prove impossible, each of the three guaranteeing Powers reserves the right to take action with the sole aim of re-establishing the state of affairs created by the Treaty. Readers should check the exact wording against the text registered in the UN Treaty Series.

Phrase	What it does	Where the argument lies
“In the event of a breach of the provisions of the present Treaty”	Trigger	Broadly accepted for the 15 July 1974 coup; contested for later events
“undertake to consult together with respect to the representations or measures necessary”	Duty to consult	Whether consultation was genuine; “measures” is not limited to diplomacy
“In so far as common or concerted action may prove impossible”	Joint action first	Who judges impossibility
“each of the three guaranteeing Powers reserves the right to take action”	Individual right	The text says “action” without defining it; whether it includes force is the central question
“with the sole aim of re-establishing the state of affairs created by the present Treaty”	Purpose limit	What the “state of affairs” is, and when the aim is achieved

Chronology, 1963–1974

• 21 December 1963: intercommunal violence erupts and Turkish Cypriots are excluded from state organs. Nicosia is divided by the Green Line on 30 December.
• 4 March 1964: UN Security Council Resolution 186 recommends a UN peacekeeping force (UNFICYP) and treats the Greek Cypriot administration as the government of Cyprus.
• 15 July 1974: the National Guard, led by Greek officers under the Athens junta, overthrows President Makarios and installs Nikos Sampson. Makarios leaves the island with British assistance and addresses the UN Security Council on 19 July.
• 17–18 July 1974: Prime Minister Bülent Ecevit consults the British government in London. No joint action emerges.
• 20 July 1974: Türkiye launches its operation, and the Security Council adopts Resolution 353 the same day.
• 22–23 July 1974: a ceasefire takes effect. Sampson resigns, the Greek junta collapses and Glafkos Clerides becomes acting president.
• 30 July 1974: the Geneva Declaration by the three guarantors refers to the existence in practice of two autonomous administrations in Cyprus.
• 14–16 August 1974: after the second Geneva conference fails, a second phase of operations ends in a new ceasefire.

Key Players & Positions

Greece and the Republic of Cyprus

The Hellenic Republic and the Republic of Cyprus describe the 1974 operation as an invasion and its aftermath as an occupation, in their foreign ministries' public statements. Their legal case rests on four points:

• Article IV authorises “action” but not the use of force, which UN Charter Article 2(4) prohibits.
• Under Charter Article 103, Charter obligations prevail over conflicting treaty rights.
• The treaty's own purpose was to protect Cyprus's independence and territorial integrity, and the operation produced division.
• Once the coup collapsed on 23 July, the “sole aim” was achieved, so continued military action and presence exceeded the clause.

Greece and the Greek Cypriot side have also argued in settlement talks, including at Crans-Montana in 2017, that guarantees and unilateral intervention rights should be abolished. Democratic Greece has condemned the 1974 junta's role in the coup.

United Kingdom

The UK was a guarantor and did not join the operation. British ministers of the day acknowledged the coup as a treaty breach and the guarantors' rights under Article IV. The House of Commons Foreign Affairs Committee's 1976 report on Cyprus is generally read as accepting that Article IV gave Türkiye a right to act. It questioned the extent of the second-phase operations. Readers should consult that report and the Hansard record directly, because the wording matters.

The United Nations record

Resolution 353 (20 July 1974) called for a ceasefire. It also called for withdrawal of foreign military personnel “present otherwise than under the authority of international agreements”. It asked Greece, Türkiye and the UK to begin negotiations “for the restoration of peace in the area and constitutional government in Cyprus.” Resolution 360 (16 August 1974) recorded disapproval of unilateral military actions. The General Assembly adopted Resolution 3212 (XXIX) in November 1974. None of these resolutions declared the Treaty of Guarantee or Article IV void, and none imposed enforcement measures under Chapter VII.

Courts

The European Court of Human Rights, in Loizidou v. Turkey and Cyprus v. Turkey (Grand Chamber, 2001), attributed responsibility to Türkiye for Convention rights in northern Cyprus because of its effective control. These judgments address responsibility under the Convention. They do not rule on whether Article IV authorised the 1974 operation.

Türkiye's Legal & Historical Position

The points below reflect the official Turkish position as stated by the Republic of Türkiye Ministry of Foreign Affairs (MFA), which calls the operation the “Cyprus Peace Operation” (Kıbrıs Barış Harekâtı).

• Treaty basis (Article IV). According to the Turkish Foreign Ministry's account of the Cyprus question, Türkiye acted as a guarantor power after the coup. It says Ecevit's consultations in London fulfilled the duty to consult, and that the UK's decision not to act jointly made “common or concerted action” impossible. Ankara argues that Article IV then allowed individual action.
• Articles I and II. Ankara argues that the coup, which was directed from Athens and aimed at Enosis, breached the prohibition on union with any State. The Turkish Foreign Ministry also says the “state of affairs” guaranteed by the Basic Articles of the Constitution was a bi-communal partnership of two equal peoples. Ankara says that partnership had already been destroyed by force in 1963–64 and that the 1974 coup removed the last chance of restoring it.
• Self-determination background. Ankara argues that Article I bars both union and partition, and that the 1963–74 violence and exclusion of Turkish Cypriots from state organs had created separation in fact. The Turkish Foreign Ministry says the operation protected Turkish Cypriots, and it presents the 1983 proclamation of the TRNC as an exercise of Turkish Cypriot self-determination. Both are consistent with the Security Council's own reference to “constitutional government.”
• The reply on the UN Charter and Resolution 353. Türkiye holds that its contingent was present under the Treaties of Alliance and Guarantee, which are “international agreements” in the sense of Resolution 353. It points out that the Security Council neither invalidated the Treaty nor invoked Chapter VII, and that the resolution itself calls for the restoration of “constitutional government.” Ankara says Greece's own junta, not Türkiye, was the party that ended the 1960 order.

These positions are presented by Ankara as the basis for its argument that any lasting settlement must recognise the sovereign equality and equal international status of Turkish Cypriots. The same background is covered in The Annan Plan Referendum and Protocol 10.

Source Comparison

Question	Greek / Greek Cypriot sources	British sources	Turkish primary sources	UN record
Was the coup a treaty breach?	Yes, and it was a junta act	Yes	Yes, aimed at Enosis, breaching Articles I and II	Resolution 353 calls for restoring constitutional government
Did consultation take place?	Consultation was inadequate or the UK's role was ambiguous	UK consulted but declined joint action	Consulted the UK on 17–18 July in London; joint action not possible	Resolution 353 invites the three guarantors to negotiate
Does “action” include force?	No; Charter Article 2(4) and Article 103 apply	Parliamentary reports are generally read as accepting a right to act, with doubts about scope	Yes; the right reserved is not limited to non-military action	No finding on Article IV
Scope and duration	Aim achieved on 23 July; later action unlawful	Questions about proportion in the second phase	Operation protected Turkish Cypriots and addressed the broken constitutional order	Resolution 360 records disapproval of unilateral actions
Terminology	Invasion, occupation	Intervention	Peace Operation, intervention	“Military actions”, “foreign military personnel”

The main divide is not over the facts of the coup but over the meaning of “action” and the end-point of the “sole aim”. For parallel treatments see The Political Anatomy, Monitor of Nations and Borders & Blocs. For how this site separates fact from position, see Editorial Principles.

Key Terms & Related Guides

• Guarantor power: one of Greece, Türkiye and the United Kingdom, each bound by Articles II and IV of the 1960 Treaty of Guarantee.
• Enosis: the Greek Cypriot nationalist goal of union with Greece, prohibited by Article I.
• State of affairs: the order set by the Basic Articles of the 1960 Constitution, whose meaning is disputed.
• Treaty of Alliance: the 1960 agreement allowing Greek and Turkish contingents on Cyprus.
• UNFICYP: the UN Peacekeeping Force in Cyprus, created in March 1964.
• GCASC: Ankara's term for the Greek Cypriot Administration of Southern Cyprus, internationally recognised as the Republic of Cyprus.

Related reading: Cyprus Treaty Architecture, The Treaty Ledger: Alexandropol, Moscow, Kars and Lausanne, The Annan Plan Referendum and Protocol 10, the Treaty And Precedent home page, and Regional Order on the Treaty of Guarantee and the two-state solution.

Treaty And Precedent presents global and regional affairs with a dedicated perspective from Türkiye. Sections marked 'Türkiye's Legal & Historical Position' reflect official Turkish policy and legal doctrines as stated by Turkish primary sources.

Treaty And Precedent Editorial Team