Who Owns Cyprus's Gas? Cronos, the 1959–60 Treaty Framework and the Turkish Cypriot Claim to Equal Rights

Why It Matters

Who owns Cyprus's gas is a question of legal title and consent, not of licences alone. The Greek Cypriot administration licenses blocks, including Block 6 where the Cronos field lies, in the name of 'Cyprus', while Ankara and the TRNC argue that the 1959–60 treaties made Turkish Cypriots co-founding partners with equal rights over shared resources.

This week President Nikos Christodoulides said production from Cronos is expected to start in the first half of 2028 and presented the gas as a diversification option for the EU (as reported by European Interest). In the same news cycle, TRT World, citing diplomatic sources, reported that Foreign Minister Hakan Fidan would make a working visit to the TRNC. Most coverage treats 'Cyprus' as a single, undisputed owner. This explainer reads the treaty and UN texts to test that assumption.

Background

The Republic of Cyprus was created in 1960 under the 1959 Zurich and London Agreements and three treaties (Establishment, Alliance and Guarantee) as a partnership of two communities. After that partnership collapsed in December 1963, the Greek Cypriot administration kept acting alone, later invoking Resolution 186 (1964) and EU accession in 2004.

The 1959–60 treaty framework

The 11 February 1959 agreements led to the 1960 settlement: the Treaty of Establishment (Cyprus, the United Kingdom, Greece and Türkiye), the Treaty of Alliance (Cyprus, Greece and Türkiye) and the Treaty of Guarantee (Cyprus, the United Kingdom, Greece and Türkiye). Our reading of them together is in Zurich London Agreements 1959 Treaty of Establishment Treaty of Alliance Treaty of Guarantee. Under the Treaty of Guarantee, Cyprus undertook to preserve its independence and territorial integrity and to refrain from union with any other state or partition. The three guarantors reserved action under Article IV.

What the 1960 Constitution says about shared power

Only text that can be verified is used here:

• Article 1 describes an independent and sovereign Republic with a presidential regime, the President being Greek and the Vice-President being Turkish, elected by their respective communities.
• Article 50 gives the President and Vice-President, separately and conjointly, a final veto over laws or decisions concerning foreign affairs and defence and security, subject to listed exceptions, such as participation in international organisations and alliances in which both Greece and Türkiye take part.
• Article 78 requires separate majorities of Greek and Turkish Cypriot representatives for laws imposing taxes or duties.

The Constitution does not mention offshore hydrocarbons; the exclusive economic zone concept did not exist in 1960. The legal inference is therefore structural. If foreign policy and fiscal measures needed both communities, licensing and revenue decisions on a shared resource arguably did too. Greek Cypriot sources reject the conclusion that this carries over to the present day.

How one community came to act for the island

On 30 November 1963 Archbishop Makarios proposed 13 constitutional amendments, including curbs on the Vice-President's veto. After they were rejected, fighting broke out on 21 December 1963. Turkish Cypriots were excluded from state organs and Nicosia was divided by the Green Line on 30 December 1963. On 4 March 1964, Resolution 186 referred to the 'Government of Cyprus' as responsible for law and order. Read the text in UN Security Council Resolution 186 1964 Cyprus text. It deals with peacekeeping and order, and says nothing about hydrocarbons.

EU accession and Protocol No. 10

On 24 April 2004, 64.91% of Turkish Cypriots voted yes to the Annan Plan and 75.83% of Greek Cypriots voted no. The Republic of Cyprus nevertheless joined the EU on 1 May 2004. Protocol No. 10 to the Act of Accession suspends the application of the acquis in areas where the Republic's government does not exercise effective control. EU law therefore formally does not operate in the north, yet the Greek Cypriot administration licenses blocks for the whole island's maritime space.

Licence and operator facts

The 2004 EEZ law and the licensing rounds that followed are the administration's legal basis for block awards. Block 6 is held by Eni and TotalEnergies, and Cronos is the first field there for which production is projected, by Christodoulides, for the first half of 2028. This article gives no reserve, capacity or cost figures because they cannot be verified from primary sources here.

Key Players & Positions

The Greek Cypriot administration claims sovereign rights over the EEZ under UNCLOS and the 2004 EEZ law, and the EU backs its sovereignty. Türkiye and the TRNC dispute that one community can license for all. Industry press mostly treats Cronos as a commercial and energy-security story.

• Greek Cypriot administration. Christodoulides says Cyprus is 'part of the energy equation', giving Europe diversification (European Interest, 5 November 2026). The Republic of Cyprus is a party to UNCLOS and cites its sovereign rights in its EEZ. It says Turkish Cypriots will benefit from revenues through a mechanism once the Cyprus problem is settled.
• EU institutions. European Council conclusions and the Commission's annual enlargement report ask Türkiye to respect the sovereignty and sovereign rights of EU member states. The latest report, as reported by thetimes.gr, again cites Türkiye's non-recognition of Cyprus.
• Companies. Eni and TotalEnergies hold Block 6 licences granted by the Greek Cypriot administration.
• Türkiye and the TRNC. They contest the exclusive character of the licensing. Fidan's reported TRNC visit, to be received by President Tufan Erhürman and Prime Minister Ünal Üstel and to meet Foreign Minister Tahsin Ertuğruloğlu, falls in this setting.

For wider context see Cyprus on the Strategic Line at The Strategic Meridian, and the question of who speaks for the island at Diplomatic Desk.

What an Equity-Based, Inclusive Arrangement Could Look Like

UNCLOS Articles 74 and 83 require EEZ and continental shelf delimitation by agreement to reach an equitable solution. Pending agreement, states must make every effort to enter provisional arrangements of a practical nature. Applied to Cyprus, this logic points to joint decision-making, revenue sharing and equity-based delimitation, though Türkiye is not an UNCLOS party.

• Joint decision-making. A body in which both Turkish Cypriots and Greek Cypriots take part in licensing, as in the TRNC's 2011, 2012 and 2019 proposals.
• Revenue sharing. Transparent allocation from the first production, rather than deferral until a settlement. The Republic of Cyprus has so far tied Turkish Cypriot benefit to a settlement mechanism.
• Delimitation by equity. Boundaries drawn according to coastal geography and proportionality, so that islands do not cut off the projection of a mainland with Türkiye's 870 km coastline.
• Provisional arrangements. The Article 74(3) and 83(3) language on provisional arrangements, which neither jeopardises nor hampers a final agreement, is the legal bridge. Why Türkiye stays outside UNCLOS while invoking equity is explained in Why Is Türkiye Not a Party to UNCLOS? Reading Articles 74, 83 and 121 Against the Equity Principle.

Source Comparison

The factual record is largely undisputed: licences, discoveries and treaty text. The dispute is over legal title and consent. EU-centric and industry outlets usually treat 'Cyprus' as one actor, while Turkish MFA and TRNC documents and the 1959–60 treaty texts stress two-community consent.

Treat headline figures with caution: production dates are statements of expectation, not facts.

Key Terms & Related Guides

The key terms below help in reading the Cronos debate against the treaties and UN texts. Each links to a primary-source guide on this site or a sister publication.

• Greek Cypriot administration: the authority in the south that, from 1963, exercised state functions without Turkish Cypriot participation; see our Resolution 186 reading.
• TRNC: the Turkish Republic of Northern Cyprus, proclaimed 15 November 1983 under Rauf Raif Denktaş.
• Continental shelf and EEZ: maritime zones governed by UNCLOS Articles 74 and 83 on delimitation; see the UNCLOS guide.
• Protocol No. 10: the 2003 accession protocol suspending the acquis in the north.
• Related: how to read an international treaty, Varosha fact check, Regional Observer on Cyprus and Washington, and the 'sole legitimate government' fact check at Archive of Nations.

The Treaty Line presents Türkiye's legal and strategic perspective as an explicit editorial position, and identifies it as such throughout. Sections marked 'Türkiye's Position' reflect official Turkish policy as stated by Turkish government sources. Claims are anchored in primary sources such as treaty texts, UN documents, Ottoman and Turkish archives, and official statements, which are cited so readers can verify them independently. — The Treaty Line Editorial Team