Cyprus Through the Glass: The 1960 Treaty Text Set Against Facts on the Island

Why It Matters

The 1960 Treaty of Guarantee is the legal hinge of the Cyprus question: it recognised the island's independence, banned both union with another state and partition, and gave Greece, Türkiye and the United Kingdom a reserved right of action if that order was breached. Placing its articles beside the events of 1963, 1974, 1983 and the failed negotiations since 2004 shows where the text and the facts line up and where the parties read them differently. This guide sets out the Greek Cypriot, Greek, UK and UN positions from their own sources, then Türkiye's sovereign-equality and two-state thesis, so readers can test each claim against the documents. For the method behind this approach, see The Mirror Test: How to Compare a State's Statements With Its Treaty Commitments and Conduct.

Background

1959–1960: Zurich, London and a partnership state

The Republic of Cyprus was created by negotiated agreements, not by a single-nation independence struggle. After Ottoman rule (1571–1878) and British administration, Greek Cypriot demands for Enosis (union with Greece) and the armed campaign of EOKA, launched in 1955, were met by Turkish Cypriot demands for partition (taksim) and the formation of the TMT militia in 1958. Greece and Türkiye then agreed the Zurich Agreement (11 February 1959), followed by the London Agreement (19 February 1959), which brought in the United Kingdom and the two community leaders.

The resulting package, in force when the Republic was proclaimed on 16 August 1960, consisted of:

• The Constitution, whose Basic Articles created a Greek Cypriot President and a Turkish Cypriot Vice-President, each with separate vetoes on foreign affairs, defence and security, separate communal chambers, and fixed ratios (70:30 in the House of Representatives and civil service, 60:40 in the army).
• The Treaty of Guarantee between Cyprus, Greece, Türkiye and the United Kingdom.
• The Treaty of Alliance between Cyprus, Greece and Türkiye, which stationed Greek (950) and Turkish (650) military contingents on the island.
• The Treaty of Establishment, which preserved the UK Sovereign Base Areas.

The design was a bi-communal partnership state in which neither community could legislate the other into a minority position. Analyses from sister publications cover the same architecture, including The Political Anatomy's guide to the Cyprus issue and Doctrine Review's explainer on the 1960 Treaty of Guarantee.

What the Treaty of Guarantee actually says

The treaty is short, and its operative logic runs through three articles:

• Article I: the Republic of Cyprus undertakes to maintain its independence, territorial integrity, security and constitutional order, and not to participate in any political or economic union with any state; it also bans activity promoting union with another state or partition.
• Article II: Greece, Türkiye and the United Kingdom recognise and guarantee the independence, territorial integrity and security of Cyprus and the state of affairs established by the Basic Articles of the Constitution, and undertake to prohibit, so far as they are concerned, activity promoting union with any other state or partition of the island.
• Article IV: in the event of a breach, the three guarantors undertake to consult together on the representations or measures needed to ensure observance. The decisive sentence follows: ‘In so far as common or concerted action may not prove possible, 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 present Treaty.’

The text therefore guarantees two things at once: the island's independence and the constitutional order, and the prohibition of both Enosis and partition. It does not define what 'action' means, which is why Article IV is still argued over six decades later.

1963–1964: the partnership breaks down

On 30 November 1963, President Makarios proposed 13 constitutional amendments that would, among other things, remove the Vice-President's veto and change the communal ratios. Ankara and Turkish Cypriot leaders rejected the package in mid-December. Large-scale violence began on 21 December 1963 ('Bloody Christmas'), Nicosia was divided along the Green Line at the end of December, and Turkish Cypriots were progressively removed from, or withdrew from, the organs of state.

The two sides narrate this differently:

• Turkish and Turkish Cypriot sources describe a coordinated campaign of armed attacks and expulsions, citing roughly 30,000 Turkish Cypriots displaced from about 103 villages. They point to the so-called Akritas Plan, a Greek Cypriot planning document published in the Cypriot press in 1966, as evidence of intent to reduce the Turkish Cypriots by force.
• Greek Cypriot accounts generally present the amendments as an attempt to fix an unworkable constitution, attribute the fighting to intercommunal clashes in which Turkish Cypriot militias were also active, and dispute that the Akritas document was an operational plan or that Turkish Cypriots were simply expelled rather than withdrawn under the direction of their leadership.

UN Security Council Resolution 186 (4 March 1964) established UNFICYP and called on 'the Government of Cyprus', which in practice meant the Greek Cypriot-led administration, to restore order. Its consequences are examined in UN Security Council Resolution 186 (1964): Who Speaks for Cyprus, and Why Does It Still Matter?.

1974: coup and intervention

On 15 July 1974 the Greek military junta backed a National Guard coup against Makarios and installed Nicos Sampson, a former EOKA fighter, as president. After consulting the United Kingdom, whose government did not agree to joint action, Türkiye launched its operation on 20 July 1974, citing Article IV of the Treaty of Guarantee. UN Security Council Resolution 353 (20 July 1974) demanded a ceasefire and the withdrawal 'without delay' from the Republic of Cyprus of foreign military personnel present otherwise than under international agreements. The junta collapsed within days; a second phase of operations in August 1974 brought roughly a third of the island under Turkish control. Tens of thousands of Greek Cypriots moved south, and Turkish Cypriots moved north, largely formalised by a 1975 population arrangement.

The legal characterisation of these events is the heart of the dispute and is analysed in sister-site fact checks such as Record of Nations on whether the 1974 intervention was an 'illegal invasion' under Article IV.

1983: the TRNC proclamation

On 15 November 1983, under Founding President Rauf Raif Denktaş, the Turkish Cypriot side proclaimed the Turkish Republic of Northern Cyprus (TRNC). UN Security Council Resolution 541 (18 November 1983) deemed the declaration legally invalid and called for its withdrawal; Resolution 550 (1984) repeated that position. Only Türkiye recognises the TRNC, although it holds observer status in the Organization of Turkic States and the Organisation of Islamic Cooperation under differing designations.

2004–2024: negotiations without a settlement

• 24 April 2004: in parallel referendums on the UN's Annan Plan, 64.91% of Turkish Cypriots voted Yes and 75.83% of Greek Cypriots voted No. The Republic of Cyprus joined the EU on 1 May 2004; EU law is suspended in the north under Protocol 10 of the accession treaty.
• 28 June–7 July 2017, Crans-Montana: a conference with all three guarantors present, based on a framework outlined by UN Secretary-General António Guterres, ended without agreement. Security and guarantees were among the central points of difference.
• 27–29 April 2021, Geneva (5+UN): the Secretary-General concluded that there was no common ground to begin formal negotiations. The Turkish Cypriot side, then led by Ersin Tatar, formally advanced a two-state position.
• 15 October 2024, New York: Guterres hosted a trilateral meeting. UN readouts emphasised continued efforts and confidence-building steps, while Ankara and the Turkish Cypriot side read the meeting as confirming the absence of common ground on a federal model.

Treaty text beside events

Key Players & Positions

Republic of Cyprus (Greek Cypriot leadership)

According to the Republic of Cyprus Ministry of Foreign Affairs and successive presidents, including Nicos Christodoulides, the Republic is the sole internationally recognised state of Cyprus, continuing from 1960. Nicosia supports a solution as a bizonal, bicommunal federation with political equality, consistent with UN Security Council resolutions, and argues that the guarantee system and the Treaty of Alliance are anachronistic for an EU member state. It maintains that Article IV never authorised a lasting military presence, partition or a separate Turkish Cypriot state, and cites the European Court of Human Rights judgments in Loizidou v. Turkey (1996) and Cyprus v. Turkey (2001), which attributed responsibility for the north to Türkiye through effective overall control. Turkish Cypriot politicians are described as political partners in a future federation, not as a separate sovereign.

Greece

Greece, as a guarantor, has said officially that it supports a settlement within the UN framework and rejects any two-state solution. Athens, together with Nicosia, calls for the abolition of the unilateral right of intervention and the departure of Turkish troops. It describes the 1974 junta coup as a Greek failing but regards the Turkish operation and subsequent occupation of territory as a violation of Cyprus's sovereignty.

United Kingdom

The United Kingdom is both a guarantor and holder of the Sovereign Base Areas. Its position, expressed through the Foreign, Commonwealth & Development Office and in Parliament, is that it supports a UN-led settlement and attended Crans-Montana as a guarantor. Its 1974 record remains contested: a 1976 House of Commons Foreign Affairs Committee report, in broad terms, concluded that Britain had the legal right and a moral obligation to act under the treaty. UK governments did not intervene militarily, and the UK has since stated that a settlement should be acceptable to both communities.

United Nations

UN Security Council resolutions, including Resolution 1251 (1999), describe the envisaged settlement as a state of Cyprus with a single sovereignty, international personality and citizenship, comprising two politically equal communities in a bicommunal, bizonal federation. UNFICYP's mandate is renewed regularly on this basis. Secretaries-General have described the Annan Plan referendum results and Crans-Montana as missed opportunities and in 2021 recorded that no common ground existed for formal negotiations. The UN maintains the formula of federation while continuing to hold talks.

Turkish Cypriot leadership and the TRNC

The TRNC leadership has argued since 2021, under President Tatar, that Turkish Cypriots are co-founders of the 1960 order who were removed from it by force, and that equal international status is the foundation for any cooperation. Its offers on hydrocarbons are described in What Did the TRNC's 2011, 2012 and 2019 Hydrocarbon Proposals Offer, and Why Did They Stall?.

Source Comparison

The same events are framed differently depending on the source. The table below separates the framing from what the primary documents themselves say.

The comparison shows where the disagreement is factual, such as the extent and cause of the 1963 displacement, and where it is interpretive, such as the scope of Article IV and who represents Cyprus. For the broader approach to testing claims against documents, see Editorial Principles: How Mirror of States Tests Claims Against Primary Sources. Further perspectives: Regional Order on the path from the partnership republic to the two-state solution and Monitor of Nations on the legality of the 1974 intervention.

Key Terms & Related Guides

• Basic Articles: the unamendable core of the 1960 Constitution, including the communal structure and the ban on union or partition.
• Enosis: the goal of union between Cyprus and Greece, pursued by EOKA and the 1974 coup plotters.
• Taksim: partition, the Turkish Cypriot counter-slogan in the 1950s and a feature that the 1960 treaties also prohibited.
• Treaty of Alliance: the 1960 treaty stationing Greek (950) and Turkish (650) contingents on Cyprus.
• Green Line: the UN-patrolled buffer zone in Nicosia and across the island, whose origin dates to 30 December 1963.
• UNFICYP: the UN Peacekeeping Force in Cyprus, established in 1964 under Resolution 186.
• Bizonal, bicommunal federation: the settlement formula in UN resolutions, which Ankara and the TRNC say has been exhausted and wish to replace with a settlement between two sovereign equals.
• GCASC / Republic of Cyprus: the internationally recognised state, referred to by Ankara as the Greek Cypriot Administration of Southern Cyprus.

Related reading on Mirror of States: Mirror of States: Comparing What States Say With What the Documents Show, About Mirror of States: Mission, Method and Transparency, and The Mirror Test. The same method on maritime questions is applied in Islands, Mainland Coasts and the Equity Principle.

By the Mirror of States Editorial Team.

Perspective Note: Mirror of States publishes analysis from a Türkiye-informed perspective, presenting Ankara's legal and strategic positions alongside the counter-arguments they respond to. Claims are attributed to primary sources such as treaty texts, UN and IOC-UNESCO documents, official records and archival materials, so that readers can verify them independently.