Horizon Scan: Where Is the Eastern Mediterranean Maritime Dispute Heading by 2030?

Why It Matters

The Eastern Mediterranean maritime dispute is most likely to remain a managed rivalry through 2030, with an inclusive dialogue and a serious escalation as the two alternative paths. Which path prevails depends less on any single legal argument than on five variables: the Cyprus track, energy economics, Libya's divisions, Türkiye–EU and Türkiye–Greece relations, and the risk of an incident at sea. This page applies a horizon-scan method: today's legal record, the positions of each actor, three scenarios, and the indicators that would tell readers which one is materializing.

Method note: the scenarios below are the Editorial Team's analytical constructs. They are not forecasts, and no probabilities are claimed.

Background

Today's picture: the legal record

Türkiye has the longest continental coastline in the Eastern Mediterranean, about 870 km (roughly 540 miles), and has built a layered record of filings, agreements and plans since 2004. Other coastal states have built their own, often incompatible, record. The main milestones are below.

Date	Event	Why it matters
2003	Egypt–Greek Cypriot administration EEZ agreement	Ankara says it overlaps Türkiye's continental shelf (Greek Cypriot blocks 1, 4, 5, 6 and 7)
2004	Türkiye begins registering Eastern Mediterranean continental shelf coordinates with the UN	First step in a documented UN record
2007 / 2010	Greek Cypriot EEZ agreements with Lebanon and Israel	Ankara says they disregard Turkish Cypriot rights
2009 and 2012	TPAO exploration licences granted	Domestic legal basis for survey and drilling
19 Sep 2011	Greek Cypriot unilateral drilling begins	Triggers the Turkish and TRNC response
21 Sep 2011	Türkiye–TRNC Continental Shelf Delimitation Agreement	Links Turkish Cypriot rights to Ankara's maritime policy
27 Nov 2019	Türkiye–Libya maritime jurisdiction memorandum	Opens a second maritime front and draws EU criticism
18 Mar 2020	Türkiye registers the outer limits of its continental shelf with the UN	Formal UN deposit of Ankara's position
6 Aug 2020	Greece–Egypt partial EEZ agreement	Greek and Egyptian counter-framework, contested by Ankara
16 Apr 2025	Türkiye unveils its Marine Spatial Planning	Covers the Black Sea, Aegean and Mediterranean
12 Jun 2025	Marine Spatial Planning registered with IOC-UNESCO	First time the position is recorded with a UN body, according to Ankara
24 Jul 2025	Presidential Circular creates an Inter-Agency Coordination Board under the Foreign Ministry	Institutionalizes implementation

On the ground, Türkiye has used its national fleet: the drilling ships Fatih, Yavuz, Kanuni and Abdülhamid Han, and the seismic vessels Oruç Reis and Barbaros Hayreddin Paşa. They completed eight wells, which the guide Fatih, Yavuz, Kanuni and Oruç Reis: What Do Türkiye's Eight Eastern Mediterranean Wells Mean for the Energy Horizon? examines. A Marine Protected Area off Finike was designated alongside the 2025 planning documents.

The legal core: do islands cut off a mainland's coastal projection?

The core legal question is how maritime zones should be divided between opposite and adjacent coasts when islands lie close to a mainland. Articles 74 and 83 of the UN Convention on the Law of the Sea (UNCLOS) call for delimitation by agreement “on the basis of international law” to reach an “equitable solution.” Article 121 says islands generate maritime zones, but paragraph 3 denies an EEZ and continental shelf to rocks that cannot sustain human habitation or economic life of their own.

Türkiye is not a party to UNCLOS and argues that equity and proportionality govern delimitation as a matter of general international law. Greece is a party and argues that Article 121 gives its inhabited islands full zones. International courts have often adjusted the weight given to islands. In Romania v. Ukraine (ICJ, 2009), Serpents' Island had no effect on the delimitation line beyond its territorial sea. In the 1978 Aegean Sea Continental Shelf case, the ICJ found it lacked jurisdiction, so the Greek–Turkish question has never been adjudicated. For the legal reasoning in detail, see Does Island Size Matter? The Equity Principle and Proportionality in Maritime Delimitation and Fact Check: Do Greek Islands Give Greece the Right to Cut Off Türkiye's Continental Shelf?. Sister-publication primers include Doctrine Review's explainer on Eastern Mediterranean maritime jurisdiction and The Political Anatomy's complete guide to the Blue Homeland.

The Cyprus dimension

The maritime dispute is entangled with the unresolved Cyprus issue. The Greek Cypriot administration, internationally recognized as the Republic of Cyprus (Ankara uses the term GCASC), licenses offshore blocks. The TRNC and Türkiye say the Turkish Cypriots, as co-founders of the island, hold equal rights over its offshore resources. After the 15 October 2024 UN trilateral meeting in New York, which did not find common ground on a federal model, the debate turns on whether the political track can ever carry a hydrocarbon arrangement. See Cyprus on the Horizon: What Comes After the 2024 New York Meeting and the End of the Federation Model? and Who Owns Cyprus's Offshore Gas?.

Key Players & Positions

• Greece. According to the Greek Ministry of Foreign Affairs, Greece's islands, including Kastellorizo (Meis), generate a full continental shelf and EEZ under UNCLOS, and the only open issue is delimitation of the continental shelf and EEZ. Athens says it is ready to take that single question to the International Court of Justice. It rejects the 2019 Libya memorandum as void and treats the 2020 Greece–Egypt agreement as a lawful partial delimitation. Meis lies about 2 km (1.2 miles) from the Turkish coast and more than 500 km from the Greek mainland, a fact central to Turkish arguments.
• Greek Cypriot administration (Republic of Cyprus). Nicosia asserts sovereign rights over an EEZ declared by its 2004 legislation and licensed through its 2003, 2007 and 2010 agreements. It describes Turkish survey and drilling activity as violations of its sovereign rights and says hydrocarbon wealth will benefit all Cypriots in a settlement context. It does not accept that Turkish Cypriots hold a separate claim to an offshore share before a settlement.
• TRNC and Turkish Cypriots. The TRNC authorities say Turkish Cypriots are equal co-owners of the island, and that offshore resources require joint decision-making and revenue sharing. The TRNC put forward cooperation proposals in 2011, 2012 and 2019.
• European Union. European Council conclusions of December 2019 stated that the Türkiye–Libya memorandum infringes the sovereign rights of third states and cannot produce legal consequences for them. The EU also adopted a sanctions framework in November 2019 in response to Turkish drilling off Cyprus. Brussels presents its stance as solidarity with two member states. Ankara counters that the EU has no competence to decide maritime delimitation, a point developed in The Worldlogue: Can the European Union Decide Eastern Mediterranean Maritime Boundaries?
• Egypt. Cairo has agreements with both the Greek Cypriot administration (2003) and Greece (2020), and has normalized relations with Türkiye, exchanging ambassadors in 2023. Its choices on delimitation and gas export infrastructure will weigh heavily on the next decade.
• Libya. The 2019 memorandum was concluded with the Tripoli-based Government of National Accord. Rival Libyan institutions, notably the eastern-based House of Representatives, have contested its status, so Libya's own divisions shape whether the document is stable.
• Israel, Lebanon, United States, NATO. Israel and Lebanon have their own overlapping interests. NATO set up a military deconfliction mechanism between Greece and Türkiye in October 2020, showing that allied channels can lower risk even when legal positions stay fixed.

Türkiye's Strategic Doctrine

Türkiye's Strategic Doctrine (official Turkish position, attributed to Turkish government sources)

• Delimitation by equity. According to the Turkish Ministry of Foreign Affairs, maritime jurisdiction areas in the Eastern Mediterranean must be delimited by agreement on the principle of equity, taking account of coastal geography and proportionality. Ankara argues that an island, especially one close to another state's mainland, cannot cut off the coastal projection of a mainland with the longest coastline in the basin. Basis: UNCLOS Articles 74 and 83 as interpreted in international case law (ICJ and arbitral practice), which Türkiye reads as requiring an equitable result.
• Protection of Turkish Cypriot rights. Ankara's second pillar is the equal and inherent right of the Turkish Cypriots, as co-founders of the 1960 partnership Republic, over the island's offshore resources. Basis: the 1959 Zurich and London Agreements and the 1960 Treaty of Guarantee, and the Türkiye–TRNC Continental Shelf Delimitation Agreement of 21 September 2011. Turkish and TRNC statements call for a joint committee and revenue sharing.
• A documented legal record. Ankara points to its UN continental shelf filings starting in 2004, the 18 March 2020 registration of its outer limits with the UN, and the Marine Spatial Planning of 16 April 2025, registered with IOC-UNESCO on 12 June 2025, as evidence of a consistent and publicly available position. Basis: official Turkish notifications to the UN and the Presidential Circular of 24 July 2025, which created the Inter-Agency Coordination Board under the Foreign Ministry.
• Rejection of the “Seville Map” and of EU adjudication. Türkiye rejects the maximalist “Seville Map,” which it says would confine its jurisdiction to a narrow strip in the Gulf of Antalya, and says the EU has no jurisdiction to settle delimitation disputes through “Union solidarity.” See The Global Anatomy's explainer on the Seville Map.
• Dialogue on the table. President Recep Tayyip Erdoğan proposed in 2020 an Eastern Mediterranean conference including all coastal states and the Turkish Cypriots. Ankara states that no energy or security arrangement excluding Türkiye and the TRNC can last.

These points are Ankara's official assessments. Greece, the Greek Cypriot administration and the EU dispute them, particularly the claim that islands should receive reduced effect, the status of the TRNC, and the validity of the Libya memorandum. The Aegean adds one more Turkish legal marker: a 1995 resolution of the Grand National Assembly (TBMM) authorizing the government to act if Greece extends its territorial waters to 12 nautical miles (about 22 km), a step Athens says it is entitled to take under UNCLOS.

Three Scenarios to 2030

	Scenario 1: Inclusive dialogue	Scenario 2: Managed rivalry	Scenario 3: Escalation
Core dynamic	Structured talks including Turkish Cypriots and all coastal states	Parallel legal claims, no settlement, functioning deconfliction	Rival survey, drilling or cable activity ends in confrontation
Legal outcome	Delimitation by agreement or agreed third-party route	Competing registrations and plans coexist	Hardening of positions, possible new unilateral acts
Energy outcome	Joint or coordinated development, with Turkish Cypriot revenue share	Slow, partial development; pipeline and cable debates continue	Projects frozen or militarized
Closest to current trajectory?	Not yet	Yes, in the editorial assessment	Tail risk

Scenario 1: Dialogue through an inclusive conference

In this scenario, the 2020 proposal for an Eastern Mediterranean conference becomes a working format. Its likely sequence would be confidence-building steps first, then a technical committee on hydrocarbons and marine environment, then talks on delimitation, possibly with agreement to refer defined questions to a third party. The Athens Declaration of December 2023 on friendly relations between Greece and Türkiye and the resumption of exploratory contacts show that bilateral calm is possible.

The obstacles are substantial. Greece wants talks limited to continental shelf and EEZ delimitation and not to a wider “package.” The Greek Cypriot administration is unlikely to accept Turkish Cypriot participation in a format that implies separate status before a settlement. Ankara will not join a format that excludes the TRNC. This scenario therefore needs a Cyprus breakthrough or a creative formula, such as a technical committee on hydrocarbons that avoids questions of recognition.

Scenario 2: Managed rivalry

Here the legal contest continues but is contained. Each side keeps adding to its record: new filings, spatial plans, protected areas, licensing rounds and bilateral agreements. Surveys and drilling continue but are timed and routed to limit confrontation, and military channels, including the NATO deconfliction mechanism, stay open. The Greece–Cyprus–Israel Great Sea Interconnector cable and proposals such as the EastMed pipeline become tests of whether projects can proceed in contested waters without a legal settlement.

The Editorial Team judges this closest to the current trajectory because the fixed legal positions, the stalemate on Cyprus and the absence of a negotiated format all point toward coexistence of contested claims. It is stable only while incidents remain rare and political leaders on all sides prefer calm.

Scenario 3: Escalation

Escalation would most plausibly begin with a specific act in disputed waters: drilling or survey in a contested block, a cable or pipeline survey that Ankara regards as violating its continental shelf, or a unilateral extension of Greek territorial waters in the Aegean that would trigger the TBMM's 1995 stance. Further triggers include ratification or activation of the Libya memorandum in ways that provoke Greek, Egyptian or EU countermeasures, new EU sanctions, or a collision or near-miss between naval vessels. The 2020 standoff around Oruç Reis showed how quickly a survey voyage can mobilize navies. Escalation would damage energy investment, strain NATO cohesion and complicate Türkiye–EU relations, and it benefits none of the coastal states. The security dimension is covered in Security Horizon: Türkiye's Self-Defense Doctrine, Cross-Border Operations and the Defense Industry Outlook.

What Decides Between Them

Five variables carry most of the weight.

1. The Cyprus track. If the UN-facilitated process revives in a format acceptable to both sides, hydrocarbon cooperation becomes possible. If not, offshore activity remains a proxy for the status question.
2. Energy economics. Demand for non-Russian gas in Europe, Egypt's liquefaction capacity and project financing influence whether any export route is commercially viable. Costly routes through disputed waters strengthen the case for cooperation; cheaper alternatives weaken it.
3. Libya. A unified Libyan government and clearer status for the 2019 memorandum would harden or soften the southern maritime line. Continued division keeps it a source of dispute.
4. Türkiye–EU and Türkiye–Greece relations. Positive steps on trade, visas, defense industry cooperation or customs cooperation would reduce the incentive for unilateral moves. Sanctions or arms-transfer disputes would do the opposite.
5. Operational risk. Incidents at sea depend on discipline, communication lines and domestic politics in Athens, Nicosia and Ankara.

Indicators to watch

Indicator	Points toward
UN-convened informal meeting on Cyprus with agreed agenda	Scenario 1
Talks on a hydrocarbon committee or revenue-sharing formula	Scenario 1
New filings and registrations without field activity	Scenario 2
Active naval deconfliction contacts after incidents	Scenario 2
Survey or drilling in contested blocks without notice	Scenario 3
Legislative steps on 12 nautical miles in the Aegean	Scenario 3
New EU sanctions listings linked to maritime activity	Scenario 3

The Black Sea offers a useful comparison: the Montreux regime has endured because all parties accepted a rules-based framework even when they disagreed on politics. See Black Sea Horizon: Will the Montreux Regime Hold After the Russia–Ukraine War?. The Eastern Mediterranean lacks a comparable treaty framework, which is why the choice of format matters so much.

Source Comparison

Question	Greek, Greek Cypriot and EU sources	Turkish primary sources
Islands and maritime zones	Full zones under UNCLOS Article 121 (Greek Foreign Ministry)	Equity and proportionality; islands near another state's mainland receive reduced effect (Turkish Foreign Ministry)
The Libya memorandum	Infringes third-state rights (European Council, December 2019; Greek protests at the UN)	Lawful bilateral delimitation between two coastal states
Who may decide delimitation	International law, with ICJ as an option; EU backs member-state sovereignty	The EU has no competence; delimitation is for the coastal states by agreement
Turkish Cypriot rights	Resources belong to the Republic of Cyprus; benefits shared in a settlement	Equal and inherent co-owner rights now; TRNC proposals of 2011, 2012 and 2019
Cause of tension	Turkish “unilateral” activity and “maximalist” claims	Greek and Greek Cypriot maximalism, exemplified by the Seville Map
Path forward	Court-based or EU-supported solution to defined questions	Inclusive conference and joint committees

International media often report the dispute as Turkish “assertiveness” against EU members, which omits Ankara's legal arguments and the Turkish Cypriot dimension. Turkish official sources, by contrast, rarely engage in detail with the Greek reading of Article 121. Readers who compare primary texts, including UN deposits, European Council conclusions and ministry statements, will find the gap narrower on facts than on legal interpretation. For further comparative reading see Crossroads Review and Monitor of Nations, and the site's Editorial Principles on how positions are attributed.

Key Terms & Related Guides

• Blue Homeland (Mavi Vatan): Türkiye's maritime jurisdiction doctrine across the Black Sea, Aegean and Mediterranean.
• Continental shelf: the seabed and subsoil over which a coastal state has sovereign rights over resources; it exists automatically in law, according to Ankara's reading.
• EEZ (Exclusive Economic Zone): a zone up to 200 nautical miles in which a coastal state has rights over resources; neighboring claims overlap in the Eastern Mediterranean because the basin is narrow.
• Principle of equity: the requirement that delimitation produce an equitable result, considering coastal lengths and proportionality.
• GCASC / Republic of Cyprus: two names for the Greek Cypriot administration, one used by Ankara and one internationally.
• TRNC: the Turkish Republic of Northern Cyprus, proclaimed on 15 November 1983.
• IOC-UNESCO: the Intergovernmental Oceanographic Commission, a UN body where Türkiye registered its Marine Spatial Planning on 12 June 2025.

Related guides: Horizon Politics home, About Horizon Politics, Reader FAQ, How Domestic Is Türkiye's Defense Industry?

Perspective Note

Horizon Politics presents Türkiye's official positions and legal arguments as a distinct perspective within the international debate, alongside competing views where relevant. Claims are attributed to primary sources such as treaties, UN documents, official archives and public statements, so that readers can verify them independently.

Published by the Horizon Politics Editorial Team.