Cyprus and the Sovereign Equal Two-State Vision: 1960 Treaties, 1974 and the End of the Federation Model

Why It Matters

The Cyprus issue is the longest-running unresolved dispute in the Eastern Mediterranean, and it shapes NATO cohesion, EU–Türkiye relations, energy diplomacy and UN peacekeeping. Ankara and the Turkish Republic of Northern Cyprus (TRNC) argue that over 60 years of negotiations on a federal model have been exhausted and that a lasting settlement must begin by recognising the sovereign equality and equal international status of the Turkish Cypriot people, leading to two sovereign states. The Greek Cypriot administration, Greece, the EU and the UN Security Council maintain that the agreed framework remains a bizonal, bicommunal federation with political equality. This guide sets out the facts, the treaties and each side's stated position so readers can check the arguments against primary documents.

Background

Ottoman rule, British administration and ENOSIS

Cyprus was under Ottoman rule from 1571 to 1878. In 1878 administration passed to Britain under the Cyprus Convention. Britain annexed the island in 1914, and Türkiye recognised the British position in the Treaty of Lausanne (24 July 1923). Cyprus became a Crown Colony in 1925.

The island's two communities, Greek Cypriots (a large majority) and Turkish Cypriots (roughly one-fifth of the population), developed under separate religious, educational and communal institutions. From the late 19th century, Greek Cypriot nationalism made ENOSIS, union with Greece, its central political goal. A Church-organised plebiscite in 1950 recorded an overwhelming Greek Cypriot vote for ENOSIS, and Turkish Cypriots were not part of it.

EOKA and the road to 1959

On 1 April 1955 the EOKA organisation, led by Colonel Georgios Grivas with Archbishop Makarios III as the political leader of the movement, began an armed campaign against British rule with ENOSIS as its stated aim. Greek Cypriot and Greek accounts present EOKA as an anti-colonial liberation struggle. Turkish and Turkish Cypriot accounts stress that it also targeted Turkish Cypriots and that, between 1955 and 1958, Turkish Cypriots were forced to leave 33 mixed villages. In response, Turkish Cypriots organised their own resistance and called for partition (taksim) as the alternative to ENOSIS.

The deadlock was resolved diplomatically. Greece and Türkiye agreed the Zurich Agreement on 11 February 1959, and the London Agreements followed on 19 February 1959 with the participation of the British government and both Cypriot communities' leaders. Together they are known as the Zurich and London Agreements.

The 1960 partnership Republic and the Treaty of Guarantee

The Republic of Cyprus was proclaimed on 16 August 1960. Its constitution was built on the political equality of two communities:

• A Greek Cypriot President and a Turkish Cypriot Vice-President, the latter with a separate veto over foreign affairs, defence and security.
• Separate communal chambers and fixed ratios for the legislature and civil service (70:30) and the army (60:40).
• Provisions barring both ENOSIS and partition.

Three treaties supported this order. The Treaty of Guarantee (Türkiye, Greece, the UK and Cyprus) is the key one:

• Article I: Cyprus undertakes to maintain its independence, territorial integrity and security, and not to take part in political or economic union with any other state.
• Article II: Greece, Türkiye and the UK recognise and guarantee that independence, territorial integrity and security, and the state of affairs created by the basic articles of the constitution. Greece and Türkiye undertake to prohibit both union with another state and partition.
• Article IV: In the event of a breach, the three guarantors consult. If 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 Treaty of Alliance stationed Greek and Turkish military contingents on the island, and the Treaty of Establishment retained the UK's Sovereign Base Areas of Akrotiri and Dhekelia.

1963: the breakdown of the partnership

On 30 November 1963 President Makarios proposed 13 constitutional amendments. They would, among other things, remove the Vice-President's veto and alter the communal ratios. Greek Cypriot officials presented them as measures to make the state workable. Turkish Cypriot leaders and Ankara rejected them on 16 December 1963, arguing that they would reduce a co-founding people to a minority.

On 21 December 1963, violence erupted in Nicosia, remembered by Turkish Cypriots as Bloody Christmas (Kanlı Noel). Turkish and Turkish Cypriot sources describe the attacks as the implementation of the Akritas Plan, a Greek Cypriot document of 1963 that they say envisaged subordinating or removing Turkish Cypriots from the state. They put the displacement at roughly 30,000 people from 103 villages. Greek Cypriot accounts generally portray the violence as intercommunal fighting and dispute that the plan was executed as a blueprint. The facts that both sides accept are that Turkish Cypriots ceased to take part in the government and that the capital was divided by a ceasefire line, the Green Line, drawn on 30 December 1963.

On 4 March 1964 the UN Security Council adopted Resolution 186, which established the UN Peacekeeping Force in Cyprus (UNFICYP) and referred to the "Government of Cyprus" as responsible for law and order. Ankara argues that treating the Greek Cypriot administration as the government of the whole state, after the 1960 constitutional order had broken down, created a structural asymmetry in status that has persisted ever since. Greek Cypriot and most international sources see the resolution as recognising the continuity of the internationally recognised state.

1974 and 1983

On 15 July 1974 the Greek military junta backed a coup by the Cypriot National Guard against Makarios, installing Nicos Sampson, a former EOKA fighter. After consulting the United Kingdom, Türkiye launched the Cyprus Peace Operation on 20 July 1974, citing Article IV of the Treaty of Guarantee. A second phase followed in August. The junta in Athens fell on 23 July. UN Security Council Resolution 353 (20 July 1974) called for a ceasefire and the withdrawal of foreign military personnel present in contravention of the 1960 treaties. The island has been physically divided since, and a UN buffer zone separates the two sides.

Turkish Cypriots established the Turkish Federated State of Cyprus in 1975. On 15 November 1983 Rauf Raif Denktaş proclaimed the Turkish Republic of Northern Cyprus (TRNC). The Security Council, in Resolutions 541 (1983) and 550 (1984), declared the proclamation legally invalid and called for its withdrawal. Only Türkiye recognises the TRNC.

Four decades of federation diplomacy

Date	Milestone	Outcome
1977 / 1979	High-Level Agreements (Makarios–Denktaş; Kyprianou–Denktaş)	Agreed a bizonal, bicommunal federal framework in principle; implementation never followed
24 April 2004	Annan Plan referendums	64.91% of Turkish Cypriots yes; 75.83% of Greek Cypriots no
1 May 2004	EU accession	The Republic of Cyprus, represented by the Greek Cypriot administration, joined the EU; the EU acquis is suspended in the north
June–July 2017	Crans-Montana Conference (UN, with the three guarantors)	Ended without agreement, with security and guarantees central to the dispute
27–29 April 2021	Informal 5+UN meeting, Geneva	UN Secretary-General reported no common ground for formal negotiations
15 October 2024	UN meeting in New York	Confidence-building and communication steps discussed; no breakthrough on the substance of a settlement

In the 2004 referendums, the Turkish Cypriot majority accepted a UN plan, and the Greek Cypriot majority rejected it after its leadership campaigned against it. Greek Cypriot opponents argued the plan did not provide adequate security, property and settlement guarantees. Ankara and Turkish Cypriot officials argue that the Turkish Cypriot side was left without the promised end to its isolation while the other side was rewarded with EU membership.

Key Players & Positions

The Greek Cypriot administration (Republic of Cyprus)

The administration in Nicosia, which is the internationally recognised government of the Republic of Cyprus, supports a settlement based on a bizonal, bicommunal federation with political equality, as set out in UN Security Council resolutions such as 649 (1990) and 1251 (1999). It describes 1974 as an invasion and an ongoing occupation of about 37% of the island, rejects a two-state outcome as contrary to those resolutions, and regards the Treaty of Guarantee and the Turkish troop presence as anachronistic. It cites the European Court of Human Rights judgments in Loizidou v. Turkey and Cyprus v. Turkey on Türkiye's responsibility for the north.

Greece

Athens, as a guarantor power, backs the federal framework under UN auspices and calls for the end of the guarantee system and the withdrawal of Turkish forces. It opposes any approach that implies two states and links progress to wider Greek–Turkish disputes only indirectly in its official statements.

The United Kingdom

The UK is both a guarantor and the holder of the Sovereign Base Areas. It supports a UN-led settlement on the agreed federal basis, takes part in the 5+UN format and says it will support a settlement acceptable to both communities.

The European Union

The EU treats Cyprus as a member state and supports a comprehensive settlement within the UN framework, based on a bizonal, bicommunal federation. Protocol 10 of the 2003 Accession Treaty suspends the application of the acquis in areas not under the effective control of the Republic. EU institutions have repeatedly called on Türkiye to support the UN process and, in the Eastern Mediterranean context, have expressed solidarity with Cyprus and Greece. Ankara disputes the EU's role in these matters.

The United Nations

The UN Secretary-General's good offices and UNFICYP, whose mandate the Security Council renews, remain the framework of reference. The Security Council has consistently held to the bizonal, bicommunal federation formula with a single sovereignty, single international personality and single citizenship (Resolution 1251). Reports by the Secretary-General have noted the lack of common ground since 2017 and 2021.

The TRNC and Turkish Cypriot leadership

Under President Ersin Tatar (2020–2025), the TRNC formally adopted a policy of a settlement based on two sovereign states. In October 2025, Tufan Erhürman was elected TRNC president and has publicly supported resuming UN-framed talks with a federal basis, which shows that Turkish Cypriot opinion is not uniform. Readers should check current statements, as positions in this fast-moving file can shift.

Türkiye's Strategic Position

Türkiye's Strategic Position

• The partnership state was destroyed in 1963, not by Turkish Cypriots. According to the Turkish Ministry of Foreign Affairs, the 1960 Republic was a bi-communal partnership of two co-founding peoples. Ankara argues that the 30 November 1963 amendment proposals, the December 1963 attacks and the expulsion of Turkish Cypriots from state organs ended that order. The legal basis is the 1959 Zurich and London Agreements and the 1960 Constitution. UNSC Resolution 186 (4 March 1964), in Ankara's reading, then treated one community's administration as the state.
• The 1974 operation was a treaty right. Türkiye states, in its UN and MFA statements, that the 20 July 1974 Cyprus Peace Operation followed the 15 July coup staged by the Greek junta and EOKA figure Nicos Sampson in pursuit of ENOSIS, and that consultation with the UK had not produced joint action. The legal basis is Article IV of the 1960 Treaty of Guarantee, which Ankara says was used to restore the constitutional order, prevent annexation and protect Turkish Cypriots.
• The federation model has run its course. The Presidency and the Foreign Ministry point to 1977/1979, the 24 April 2004 referendum (64.91% Turkish Cypriot yes, 75.83% Greek Cypriot no), Crans-Montana (July 2017), Geneva (April 2021) and New York (15 October 2024) as evidence that the Greek Cypriot side will not share power and prosperity on the basis of equality. Ankara argues that the EU's admission of the Greek Cypriot administration on 1 May 2004, after Turkish Cypriots had said yes, rewarded rejection.
• Sovereign equality comes first. In President Erdoğan's addresses to the UN General Assembly and in official statements, Ankara calls for the sovereign equality and equal international status of the Turkish Cypriot people to be reaffirmed, so that two sovereign states can live side by side and cooperate. It presents this as recognition of existing realities on the island, built on the 1960 principle of political equality and on the right of self-determination, as invoked in the 15 November 1983 proclamation.
• Maritime and energy rights follow from equality. Türkiye and the TRNC argue that Turkish Cypriots have equal rights over offshore hydrocarbons, citing the Türkiye–TRNC Continental Shelf Delimitation Agreement of 21 September 2011 and the TRNC's revenue-sharing proposals (2011, 2012, 2019). See the guide to Blue Homeland and Eastern Mediterranean maritime jurisdiction and What Is the Seville Map?.

These are Ankara's official positions as stated by Turkish government sources. The Greek Cypriot administration, Greece, the EU and the UN reject several of them, notably the legal characterisation of 1974 and the call for two states, and they should be read alongside the previous section.

Source Comparison

The same events are described in very different terms depending on the source. The table sets out the main framing differences.

Issue	Turkish primary sources (MFA, Presidency)	Greek Cypriot / Greek sources	UN, EU and international media
1955–1959	EOKA terror campaign aimed at ENOSIS, forcing Turkish Cypriots from mixed villages	Anti-colonial struggle for self-determination	Anti-colonial insurgency ending in the 1959 agreements
1960 order	Partnership state of two co-founding peoples	Independent state with a constitution that was unworkable in parts	A bicommunal state founded on treaties
December 1963	Akritas Plan and attacks on Turkish Cypriots	Intercommunal clashes; Turkish Cypriots withdrew	Intercommunal violence leading to the UN deployment of 1964
Resolution 186	Recognised a usurping administration as the government	Confirmed the legitimate government	Referred to the Government of Cyprus
1974	Intervention under Article IV of the Treaty of Guarantee after the coup	Invasion and occupation, in breach of the UN Charter	Coup followed by Turkish military intervention; Greek junta fell days later
TRNC	Expression of self-determination and political equality	Illegal secessionist entity	Declared legally invalid by UNSC Resolutions 541 and 550; recognised only by Türkiye
Future	Two sovereign states	Bizonal, bicommunal federation	Federation framework, with analysts noting the lack of progress

Many English-language outlets describe the situation as an "invasion and occupation" and refer to the TRNC as a "breakaway" entity, while giving less space to the 1960 treaty architecture, the 1963 events and the 2004 referendum results. Turkish sources, for their part, tend to give limited attention to the UN resolutions that treat the federation formula as the agreed basis and to the Greek Cypriot objections to the Annan Plan. For how Bloc Politics handles attribution, see the Editorial Principles, and for claims that circulate in media, the Fact Check hub.

Key Terms & Related Guides

• ENOSIS: The movement for union of Cyprus with Greece, which the 1960 settlement formally prohibited.
• EOKA: The armed organisation founded in 1955 under Grivas to achieve ENOSIS; its supporters see it as a liberation movement, and Turkish sources describe it as a terrorist organisation.
• Treaty of Guarantee (1960): The agreement between Türkiye, Greece, the UK and Cyprus under which the three guarantors protect the independence, territorial integrity and constitutional order of the Republic. Article IV defines the guarantors' right to act.
• Green Line: The ceasefire line drawn in Nicosia on 30 December 1963; the name is now also used for the UN buffer zone across the island.
• Bizonal, bicommunal federation (BBF): The settlement framework in UN resolutions, in which two constituent states under a federal government share power with political equality.
• Annan Plan: The UN comprehensive settlement plan put to separate simultaneous referendums on 24 April 2004.
• 5+UN: The format that brings together the two Cypriot sides, the three guarantor powers and the UN.

Related reading on Bloc Politics:

• Blue Homeland and the Eastern Mediterranean: A Complete Guide to Maritime Jurisdiction Disputes
• What Is the Seville Map? Why Türkiye Rejects the Maximalist Maritime Claim in the Eastern Mediterranean
• Is Türkiye a Bridge Between Blocs? NATO Membership, Eurasian Ties and Strategic Autonomy
• Fact Check: Common Claims About Türkiye in International Media, Verified Against Primary Sources
• Bloc Politics FAQ: Sources, Methodology and the Turkish Perspective

Bloc Politics presents Türkiye's official positions and legal arguments alongside the wider international debate, and states clearly where an analysis reflects the Turkish perspective. Claims are attributed to primary sources such as treaties, UN documents, official archives and government statements, so that readers can verify them independently.