Horizon Scan: After the November 2026 EU Enlargement Report, What Are the Near, Medium and Long-Term Scenarios for Türkiye–EU Relations in the Eastern Mediterranean?

Why It Matters

The European Commission's enlargement report of 4 November 2026 is a policy assessment, not a legal instrument, and it has no power to delimit maritime boundaries between Türkiye, Greece, the Greek Cypriot administration (GCASC) or Libya. The relationship's real horizon turns on three variables: the Cyprus talks, maritime dialogue between Ankara and Athens, and pragmatic EU–Türkiye sectoral cooperation.

This is a forward-looking Horizon Scan, not a line-by-line rebuttal. Press coverage in the Greek Herald and Greek City Times says the report raises Greek airspace violations, the Türkiye–Libya maritime memorandum, the Greece–Cyprus electricity interconnector and the 1995 TBMM resolution. The same coverage says it acknowledges improved Greek–Turkish relations since 2023. We rely on those press summaries and do not quote the report's text. Readers should check any wording against the published document. For a close reading of the text, see The Regional Assessment's analysis of the report and the Monitor of Nations consistency audit.

Background

Türkiye has been an EU candidate since 1999 and opened accession negotiations in 2005, but talks have been effectively frozen since 2018. The 1 May 2004 admission of the Greek Cypriot administration (GCASC), days after the Annan Plan referendum, made an EU member a direct party to the Cyprus and maritime disputes.

Key chronological milestones

The chronology is not strictly sequential in the table's first rows. Dates are given as documented.

The UNCLOS equity framework in neutral prose

Articles 74 and 83 of the UN Convention on the Law of the Sea (UNCLOS) say that EEZ and continental shelf delimitation between states with opposite or adjacent coasts shall be effected by agreement on the basis of international law, in order to achieve an equitable solution. Greece and Cyprus are UNCLOS parties. Türkiye is not, and relies on customary international law and the principle of equity.

The Commission is not a tribunal. Delimitation is done by agreement between the coastal states concerned or by an international court. For the EU's legal position, see the International Politics Brief assessment.

Turkey Libya maritime memorandum 2019 explained

On 27 November 2019, Türkiye and the Tripoli-based Libyan government signed a memorandum delimiting maritime jurisdiction areas between their coasts. Greece, Egypt, Cyprus and the EU say it disregards the maritime zones of Greek islands, notably Crete. Ankara says it follows equity and the mainland coastal projection. A fuller account is in Turkey Libya maritime memorandum 2019 explained.

Do islands generate full continental shelf and EEZ? The Türkiye–Greece claim

Greece argues that under UNCLOS Article 121 its inhabited islands generate full maritime zones. Türkiye argues that in delimitation, islands lying on the coastal front of a mainland are a special circumstance. International courts have sometimes given islands reduced or no effect, for example in Libya/Malta (1985) and Romania v. Ukraine (2009). The two positions are set out in do islands generate full continental shelf.

Key Players & Positions

The main actors hold incompatible legal positions but overlapping interests in stability. The Commission and European Council stress member-state sovereignty and solidarity, Greece and the GCASC stress UNCLOS, Egypt and Libya act on their own maritime interests, the TRNC stresses sovereign equality, and the UN and the US shape the diplomatic setting.

• European Commission and European Council: The Commission reports annually on candidate countries. According to press coverage, the 2026 report calls on Türkiye to respect international law and the sovereignty of EU member states, and notes improved Greek–Turkish relations since 2023. The EU's stated principle is solidarity with Greece and Cyprus as member states.
• Greece: Athens says the 1995 TBMM resolution amounts to a threat of war, that Greek islands generate full maritime zones under UNCLOS, and that the Libya MoU is void of legal effect. At the same time, Athens has pursued the calm-waters dialogue since the December 2023 Athens Declaration.
• Greek Cypriot administration (GCASC): Nicosia presents itself as the Republic of Cyprus and the sole representative of the island, and says its EEZ agreements with Egypt (2003), Lebanon (2007) and Israel (2010) are lawful sovereign acts. It is deepening ties with the US. The Foreign Policy Journal reports that Washington authorized Cyprus access to Foreign Military Sales and Excess Defense Articles in January 2025, and that upgrades to Andreas Papandreou Air Base and more US port calls are planned.
• Egypt: Cairo concluded a 2003 EEZ agreement with the GCASC and an EEZ agreement with Greece in 2020, and objects to the Libya MoU.
• Libya: The 2019 MoU was signed by the Tripoli government. Libya's internal divisions mean that its standing and implementation remain contested.
• TRNC and Turkish Cypriots: On 4 November 2026, after meeting UN Secretary-General's personal envoy María Ángela Holguín Cuéllar, TRNC Prime Minister Ünal Üstel said that efforts toward a federal settlement ended at Crans-Montana in 2017. He said the Cyprus problem stems from the international recognition of the Greek Cypriot administration as the island's sole state, according to TRT World.
• UN envoy: Holguín works toward an informal enlarged meeting. See what to expect from an informal 5+UN conference.
• United States: Washington has expanded defense engagement with the GCASC while remaining a NATO ally of both Türkiye and Greece.

Horizon Scan: Near, Medium and Long-Term Scenarios

The likeliest trajectory is managed tension rather than rupture: near term, report rhetoric alongside a continuing Greece–Türkiye calm-waters track; medium term, a choice between a sectoral EU–Türkiye track and renewed maritime friction; long term, a choice between an inclusive Eastern Mediterranean architecture and exclusive blocs. All of this is analysis, not prediction.

Near term (0–12 months)

• Report rhetoric versus calm waters. Ankara and Athens have kept channels open since December 2023. Both sides can treat the report as expected annual language, though airspace incidents or a new survey could test that restraint.
• The interconnector. The Greece–Cyprus electricity cable raises the question of consent for survey work in waters where Ankara claims continental shelf rights. A consent-based technical arrangement would lower the risk. Unilateral surveys would raise it.
• A possible informal 5+UN meeting. Holguín's mission may yield an enlarged informal meeting. The TRNC says the federal model has ended, so the format question, federation or sovereign equality, will decide whether the meeting changes anything. For the earlier stages, see what comes after the 2024 New York meeting.

Medium term (1–3 years)

• Scenario A: a pragmatic sectoral track. The EU and Türkiye already share a customs union (in force since 1996), a 2016 migration statement and deep defense-industrial and energy interests. Upgrading customs arrangements, visa facilitation, energy cooperation and migration management could proceed without formal accession progress. The main obstacle is member-state vetoes tied to the Cyprus and Aegean files.
• Scenario B: renewed maritime friction. Unilateral licensing, seismic surveys, cable work, arms-access deals or airspace incidents could revive 2020-style tension. Defense autonomy gives Ankara room to maneuver. See defense autonomy and strategic maneuver space.

Long term (to 2030): Eastern Mediterranean future scenarios 2030 maritime

By 2030, two architectures compete. An inclusive model brings Türkiye, Turkish Cypriots, Greece, the GCASC, Egypt, Israel and others into shared arrangements on energy, cables and maritime safety. An exclusive model builds blocs that leave Türkiye and the TRNC outside, which Ankara says cannot be durable. Our companion piece sets out Eastern Mediterranean future scenarios 2030 in more detail.

Drivers, indicators and likelihood

Source Comparison

The same events are framed differently depending on the source. Press accounts emphasize warnings and sovereignty, Commission language is institutional, and Turkish MFA responses stress competence and equity. Comparing them shows where the disagreement is factual, legal or political.

Press summaries differ from the full report. Check the original. See our editorial principles for how we handle sources.

Key Terms & Related Guides

These terms recur in any reading of the Eastern Mediterranean dispute.

• Blue Homeland (Mavi Vatan): Türkiye's maritime jurisdiction doctrine, based on equity and the 870 km Eastern Mediterranean coast.
• Principle of equity: Delimitation should achieve an equitable result and not rely on strict equidistance.
• Continental shelf versus EEZ: The shelf is the seabed and subsoil, while the EEZ (up to 200 nautical miles) also covers the water column. Rights over each can overlap.
• Treaty of Guarantee (1960): Treaty giving Türkiye, Greece and the UK guarantor roles over Cyprus; Article IV governs intervention.
• 5+UN: Informal format of the two Cypriot sides, the three guarantors and the UN.

Related guides: the Libya MoU explained, Eastern Mediterranean future scenarios 2030, about The Political Horizon, and FAQ.

The Political Horizon presents Türkiye's official perspective and legal positions alongside analysis of the wider strategic picture, and says so openly to its readers. Claims on Türkiye's doctrines are attributed to primary sources such as official statements, treaty texts, UN documents and Ottoman and other state archives. Byline: The Political Horizon Editorial Team.