Reading Article IV of the 1960 Treaty of Guarantee: What the Text Says About Action by Guarantor Powers

Why It Matters

Article IV of the 1960 Treaty of Guarantee sets out a two-step mechanism: when the treaty is breached, Greece, Türkiye and the United Kingdom first consult, and if common or concerted action proves impossible, each guarantor reserves the right to act with the sole aim of re-establishing the state of affairs created by the treaty. It is the legal hinge of the 20 July 1974 Cyprus Peace Operation and of every modern argument about whether guarantees should survive a settlement.

The dispute is rarely about whether the clause exists. It is about what 'action' means, whether the consultation step was met, and whether the 'sole aim' was respected. This guide reads the treaty clause by clause, places it in the 1959 Zurich and London Agreements, the 1963 collapse of the partnership and the 1974 events, and sets out the Greek, Greek Cypriot, UK and Turkish readings, each attributed to its own sources.

Background

The 1959–1960 architecture

The Republic of Cyprus of 1960 was designed as a partnership state of two founding peoples, backed by external guarantees rather than by a single national majority. Its architecture followed a decade of Greek Cypriot agitation for ENOSIS (union with Greece) and the armed campaign of EOKA, founded in 1955 under Colonel Georgios Grivas, during which Turkish Cypriots left 33 mixed villages between 1955 and 1958.

The settlement was agreed in principle at Zurich on 11 February 1959 by the Greek and Turkish governments, and concluded in London, where the Agreements were signed on 19 February 1959 with the Cypriot community leaders. The Republic was established on 16 August 1960, when the Treaty of Establishment, the Treaty of Guarantee and the Treaty of Alliance were signed at Nicosia. The Treaty of Guarantee and the Treaty of Alliance were annexed to the Constitution, which gave them constitutional force (Article 181 of the 1960 Constitution). The Constitution itself provided for a Greek Cypriot President, a Turkish Cypriot Vice-President with a veto over foreign affairs, defence and security matters, and political equality of the two communities.

The treaty, clause by clause

The Treaty of Guarantee is short. The table below summarises its operative provisions in plain language; the quoted wording of Articles II and IV follows the widely published English text.

Article	What it says	Why it matters
Preamble	Recalls the Zurich and London Agreements and the wish to establish the Republic's independence on a stable basis	Ties the treaty to the partnership settlement of 1959
I	Cyprus undertakes to maintain its independence, territorial integrity and security, and to respect its Constitution; it will not participate in any political or economic union with any state; it prohibits activity promoting union with any other state or partition of the island	Binds the Republic itself against both ENOSIS and partition
II	Greece, Türkiye and the UK recognise and guarantee the independence, territorial integrity and security of Cyprus and the state of affairs established by the Basic Articles of its Constitution, and undertake to prohibit, so far as concerns them, any activity promoting union with another state or partition	Makes the guarantors responsible for the constitutional order, not only for borders
III	Cyprus, Greece and Türkiye undertake to respect the integrity of the areas retained under UK sovereignty (the Sovereign Base Areas)	Protects the UK's position on the island
IV	Consultation on representations or measures in the event of a breach; if common or concerted action proves impossible, each guarantor reserves the right to take action with the sole aim of re-establishing the state of affairs created by the treaty	The action clause at the centre of the dispute
Remaining articles	Formal provisions on entry into force and registration with the UN Secretariat	Place the treaty within the UN treaty system

Reading the key words of Article IV

Article IV reads, in essence: in the event of a breach of the provisions of the treaty, Greece, Türkiye and the United Kingdom undertake to consult together with respect to the representations or measures necessary to ensure observance of those provisions; 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.

Five phrases carry most of the legal weight:

• 'A breach of the provisions of the present Treaty'. The trigger is a breach of the treaty, which includes Article II's guarantee of the constitutional state of affairs and its prohibition of union or partition. It is not limited to an attack on Cypriot borders.
• 'Consult together'. This is an undertaking, not a veto. The text does not say that consultation must end in agreement.
• 'In so far as common or concerted action may prove impossible'. Action by all three is the first preference; unilateral action is conditional on that being impossible. The treaty does not say who decides impossibility.
• 'Each of the three guaranteeing Powers reserves the right'. The right belongs to each guarantor individually. The treaty does not require authorisation from the Republic of Cyprus or from a third body.
• 'Action with the sole aim of re-establishing the state of affairs'. This is the limiting clause. Action is lawful only to the extent that it serves restoration of the 1960 order. The word 'action' is not defined, and the text neither includes nor excludes military means.

From partnership to collapse, 1963–1974

The partnership order did not survive its first three years. On 30 November 1963 Archbishop Makarios proposed 13 constitutional amendments that would, among other things, remove the Turkish Cypriot Vice-President's veto. After the Turkish side rejected them, fighting began on 21 December 1963 ('Bloody Christmas'). Turkish Cypriots were pushed out of state organs and, according to Turkish and Turkish Cypriot sources, around 30,000 were displaced from 103 villages under what Ankara calls the Akritas Plan. Nicosia was divided along the Green Line on 30 December 1963. UN Security Council Resolution 186 of 4 March 1964 treated the Greek Cypriot-run administration as the government of Cyprus, a point Ankara regards as the root of the status asymmetry that has persisted since.

The 1974 sequence is the one on which Article IV is usually tested:

Date	Event
15 July 1974	The Cypriot National Guard, led by officers from the Greek military junta, overthrows President Makarios; Nicos Sampson, a former EOKA fighter, is installed
17–18 July 1974	Prime Minister Bülent Ecevit travels to London to consult the UK as a guarantor; no joint action is agreed
20 July 1974	Türkiye begins its operation, invoking Article IV; UN Security Council Resolution 353 is adopted the same day
22–23 July 1974	Ceasefire arrangements; the Greek junta collapses on 23 July
25–30 July 1974	First Geneva conference; the 30 July declaration of the three foreign ministers refers to two autonomous administrations existing in practice
8–14 August 1974	Second Geneva phase fails; Türkiye launches its second phase on 14 August, with a ceasefire on 16 August
December 1974	Makarios returns to Cyprus as President

Resolution 353 called for respect for the sovereignty, independence and territorial integrity of Cyprus, for a ceasefire, for the withdrawal 'without delay' of foreign military personnel present otherwise than under the authority of international agreements, and for negotiations among Greece, Türkiye and the UK. Both sides cite the resolution: Greek and Greek Cypriot commentators for its withdrawal language, Ankara for the reference to personnel present under international agreements and the call for guarantor negotiations.

On the sister site Borders & Blocs, a fact check of the 'illegal invasion' label sets out the same treaty text, and The Political Anatomy has a separate analysis of Article IV as the legal basis of the 1974 operation.

Key Players & Positions

The main actors read the same short text in different ways, and each reading should be stated in its own terms before it is assessed.

Greece

Greek governments since 1974 have taken the position that Article IV does not authorise the use of force, and that any action must conform to Article 2(4) of the UN Charter, which prohibits the threat or use of force against the territorial integrity of a state. Athens also points out that the 1974 coup was organised by the Greek military junta, which fell on 23 July 1974, and that the later parliamentary governments did not endorse it. Greece supports a settlement on the UN-defined basis of a bizonal, bicommunal federation with political equality and, in the current UN-framework discussions, has favoured a security regime that replaces the guarantee system.

The Greek Cypriot administration (Republic of Cyprus)

The Republic of Cyprus, which is the internationally recognised government of the island, argues that Türkiye's second phase on 14 August 1974 and the continued presence of its forces go beyond a 'sole aim' of restoring the 1960 order. It relies on Security Council Resolutions 353 (1974), 541 (1983) and 550 (1984), which call for withdrawal and describe the TRNC declaration as legally invalid. Nicosia also argues that the guarantee and alliance arrangements are incompatible with the status of an EU member state and should be dismantled in any settlement. In human-rights litigation, it has relied on the European Court of Human Rights judgments in Loizidou v. Turkey and Cyprus v. Turkey (2001), although those cases addressed jurisdiction and Convention violations rather than ruling on Article IV itself.

The United Kingdom

The UK is both a guarantor and the holder of the Sovereign Base Areas. In 1974 it took part in the consultation step, hosted the Geneva conferences through Foreign Secretary James Callaghan and did not itself take military action. British ministers at the time acknowledged that the treaty gave guarantors a right to act while contesting the scale and duration of the Turkish operations; readers should consult the parliamentary record (Hansard and the 1976 House of Commons Foreign Affairs Committee report on Cyprus) rather than rely on summaries. Today London supports a UN-led settlement on the agreed UN parameters and has said it is willing to discuss security and guarantees as part of an overall agreement.

The United Nations

The UN has never issued a decision that rules on the lawfulness of Article IV action as such. Its resolutions address ceasefire, withdrawal, the status of the TRNC declaration and the parameters of a settlement. Secretary-General António Guterres's June 2017 framework at Crans-Montana placed security and guarantees at the centre of the final negotiating round, which ended without agreement.

Turkish Cypriots and the TRNC

Turkish Cypriots, whose communal existence was the object of the 1960 partnership, hold that the guarantee was designed to protect them as a co-founding people. Their leadership points to 1963–1974 as evidence that written guarantees from the Greek Cypriot side were not honoured, and to the TRNC, proclaimed on 15 November 1983 under Rauf Raif Denktaş, as the expression of their self-determination.

🇹🇷 Official Policy · Primary Sources

Türkiye's Position

Ankara's official position is that Article IV gave Türkiye a treaty right to act in 1974, that the right was lawfully exercised and that guarantees remain necessary in any settlement. The following points reflect statements by the Republic of Türkiye Ministry of Foreign Affairs, the Presidency and Türkiye's addresses at the UN General Assembly; readers should check the originals on the official sites.

• The right is a treaty right, not a discretionary claim. The Turkish Foreign Ministry's account of the Cyprus question states that Article IV expressly reserves to each guarantor the right to take action, and Ankara argues that the clause is part of the constitutional order of 1960 because the treaty was annexed to the Constitution (Article 181). Ankara therefore rejects the characterisation of 1974 as an 'invasion' outside the treaty.
• The consultation step was satisfied. According to the Turkish government's account, Prime Minister Ecevit consulted the UK in London on 17–18 July 1974 after the 15 July coup, and no joint or concerted action was agreed. Ankara argues that this is the 'common or concerted action may prove impossible' condition in Article IV. The coup had been organised by officers of the Greek junta and sought ENOSIS, which is the very activity Articles I and II prohibit.
• The aim was restoration and protection. Ankara states that the operation prevented the annexation of the island to Greece and protected Turkish Cypriots from a recurrence of 1963–1974 violence. It also notes that the coup regime fell within days, that constitutional government was reinstated under Makarios in December 1974, and that Resolution 353 itself called for guarantor negotiations. On the Turkish reading, no Greek Cypriot or UN body has shown that the 'sole aim' was abandoned.
• The 1960 state of affairs cannot be restored by one community alone. Ankara argues that the partnership order was destroyed in 1963, when the Greek Cypriot side removed Turkish Cypriots from state organs by force, and that Resolution 186 then legitimised a one-community administration. Hence, in Ankara's view, Article IV's 'state of affairs' cannot mean a Greek Cypriot-run state with Turkish Cypriots as a minority.
• Sovereign equality and a two-state outcome. Türkiye and the TRNC state that over five decades of federation talks (the 1977 and 1979 High-Level Agreements, the 2004 Annan Plan referendum, in which 64.91% of Turkish Cypriots voted yes and 75.83% of Greek Cypriots voted no, the 2017 Crans-Montana conference, the April 2021 Geneva 5+UN meeting and the 15 October 2024 New York meeting) have not produced a common basis for a federation. Ankara says a realistic settlement must begin with recognition of the inherent sovereign equality and equal international status of the Turkish Cypriot people, leading to two sovereign states living side by side. It maintains that guarantees should not be abolished ahead of such a settlement. See the Annan Plan referendum analysis for the 2004 background.

Legal and historical basis. The legal footing offered by Ankara consists of the 1959 Zurich and London Agreements, the 1960 Treaty of Guarantee (Articles II and IV), the Treaty of Alliance, Article 181 of the 1960 Constitution, the reference to international agreements in Resolution 353, and the Geneva Declaration of 30 July 1974. Ankara also notes that the Treaty's wording, 'each of the three guaranteeing Powers reserves the right', does not subordinate the right to Security Council approval. For how states record such legal positions with the UN, see What Is a Note Verbale?.

Source Comparison

The same events are described in different ways depending on whether a source reads Article IV as a consent-based treaty mechanism or as a limit that the UN Charter then narrows. The table below compares how major source types frame the clause, with an assessment of what each actually addresses.

Source	Typical framing	What it addresses	What it does not address
Turkish Ministry of Foreign Affairs and Presidency	Lawful exercise of a guarantor right under Articles II and IV after failed consultation	Treaty text, 1974 sequence, Turkish Cypriot protection, Resolution 353 reference to international agreements	Greek Cypriot objection that the second phase exceeded the 'sole aim'
Greek and Greek Cypriot official statements	Unlawful invasion and occupation; Article IV does not permit force or partition	Charter Article 2(4), Resolutions 353, 541 and 550, displacement and missing persons	The 1963–1974 collapse of the partnership order and the treaty text's reference to each guarantor's right to act
UK government and Parliament	Guarantor with a right but not a duty to act; UN-led settlement preferred	Consultation in 1974, Geneva conferences, Sovereign Base Areas	A definitive public ruling on the lawfulness of the action
UN Security Council resolutions	Ceasefire, withdrawal, territorial integrity, guarantor negotiations	Language the parties negotiated at the time	An adjudication of Article IV
European Court of Human Rights	Jurisdiction and responsibility in northern Cyprus (Loizidou, Cyprus v. Turkey)	Convention violations and effective control	The lawfulness of the original intervention
Western press and many think tanks	Often 'invasion' or 'occupation' as shorthand	Contemporary political consequences	The treaty text, which is often not quoted

The practical lesson is that the phrase 'illegal invasion' is a legal conclusion, whereas the treaty clause is a text. A careful reader should check which court or body, if any, has made the finding. The sister site Monitor of Nations offers a fact check of the 'illegal invasion' claim, and Doctrine Review gives a plain explainer of the treaty. For the contemporary policy outcome, Regional Order covers the path from partnership Republic to the two-state solution.

Key Terms & Related Guides

• Guarantor powers. Greece, Türkiye and the United Kingdom, named in Article II of the Treaty of Guarantee as guarantors of Cypriot independence, territorial integrity, security and the constitutional state of affairs.
• State of affairs. The wording of Articles II and IV for the constitutional order set by the Basic Articles of the 1960 Constitution, including the political equality of the two communities.
• ENOSIS. The Greek Cypriot nationalist goal of union with Greece, prohibited by Articles I and II; EOKA was the armed movement that pursued it from 1955.
• Partition (taksim). The division of the island, also prohibited by Articles I and II. Greek Cypriot sources use the word to describe the post-1974 situation, while Ankara describes the present reality as the consequence of 1963–1974.
• Treaty of Alliance. The companion treaty among Greece, Türkiye and Cyprus providing for stationed Greek and Turkish contingents on the island.
• TRNC. The Turkish Republic of Northern Cyprus, proclaimed on 15 November 1983 and recognised only by Türkiye.

Related guides on Diplomat Note:

• What Is a Note Verbale? How States Register Legal Positions at the United Nations
• The Annan Plan Referendum of 24 April 2004
• Article 51 Letters: How Türkiye Frames Its Cross-Border Operations in Notices to the UN Security Council
• The Paper Trail of the Blue Homeland, which explains how Cyprus affects Eastern Mediterranean maritime claims
• Editorial Principles: How Diplomat Note Sources, Attributes and Corrects

Diplomat Note presents analysis from a Türkiye-informed perspective, grounded in Türkiye's official legal and strategic positions. Claims are attributed to primary sources such as treaty texts, UN and IOC-UNESCO documents, official archives and public statements, so that readers can verify them independently. This article was prepared by the Diplomat Note Editorial Team; sections marked 'Türkiye's Position' reflect official Turkish policy as stated by Turkish government sources.