Türkiye’s Maritime Bill Turns Blue Homeland Into Legal Test for Greece and Cyprus

Bosphorus News Geopolitics Desk

Türkiye is preparing to move a draft maritime jurisdiction law toward parliament in early June, opening a new legal phase in the long-running dispute over the Aegean, the Eastern Mediterranean, Cyprus and the Turkish Straits.

The 14-article draft, presented publicly on May 12 through Ankara University's National Center for the Sea and Maritime Law, would replace Türkiye's 1982 Territorial Waters Law and bring internal waters, territorial waters, the contiguous zone, the continental shelf and the exclusive economic zone into a single domestic legal framework.

The proposal is politically framed around the Blue Homeland doctrine, but the leaked and reported text avoids the direct use of phrases such as "Blue Homeland" and "gray zones." That technical language is important. Ankara is not simply turning a slogan into law. It is trying to place long-held Turkish maritime positions inside a statutory framework that future governments, courts and state institutions would have to treat as part of domestic law.

The draft follows an earlier phase of the debate in which Bosphorus News detailed how Türkiye's Blue Homeland framework was moving from political doctrine into a draft maritime jurisdiction law with direct implications for the Aegean and Eastern Mediterranean.

The bill would preserve Türkiye's six-nautical-mile territorial waters in the Aegean, define the status of islands, islets and rocks in line with Ankara's position, and reflect Türkiye's view that maritime jurisdiction in contested areas should be measured primarily from continental mainland coasts rather than from islands. It would also give the president authority to declare "special status maritime areas" and require Turkish approval for economic, scientific and environmental activity inside maritime zones claimed or defined by Türkiye.

One of the most sensitive parts concerns the Turkish Straits. The draft would define the Bosphorus, the Dardanelles and the Sea of Marmara as internal waters within a domestic legal framework while preserving the reference to the Montreux Convention. That gives the proposal a Black Sea dimension at a time when the Russia-Ukraine war is already testing maritime security, naval access and commercial shipping around Türkiye.

Turkish officials have described the bill as a codification of existing positions, not a new claim-making exercise. DEHUKAM President Cem Başkara said Blue Homeland is "wherever a ship carrying the Turkish flag reaches." Çağrı Erhan, a member of the Presidential Security and Foreign Policies Council, called the draft the clearest document setting out Türkiye's view of the seas. Maritime law scholar Yücel Acer framed the proposal as a move to legalize existing positions rather than create new demands.

The Defence Ministry has also backed the need for a legal framework, saying the bill would define Türkiye's responsibilities in maritime jurisdiction areas and close gaps in domestic law.

Greece and Cyprus are reading the same draft very differently.

Greek government spokesman Pavlos Marinakis dismissed the proposal as a move prepared for domestic consumption, arguing that unilateral national legislation carries no weight under international law. Athens has also pointed to its March 31, 2026 letter to the United Nations, in which Greece rejected Türkiye's maritime arguments and defended its own legal position on islands and maritime delimitation.

The Aegean layer of the bill lands in an already tense debate over islands, islets and maritime jurisdiction. Bosphorus News recently examined how Greek Defence Minister Nikos Dendias's Agathonisi visit fed into the Türkiye-Greece dispute over Blue Homeland, sovereignty and the eastern Aegean.

The dispute is not confined to maps and legal memoranda. It is already moving through smaller but politically charged files such as fishing rights, coast guard activity and local enforcement. Bosphorus News recently reported that Greece asked the EU to intervene over Turkish fishing activity, showing how maritime jurisdiction disputes can quickly shift from diplomatic language into daily encounters at sea.

Cyprus has pushed the issue toward Brussels. President Nikos Christodoulides said he expects a European reaction if the draft passes through Türkiye's parliament, arguing that it affects Cyprus, Greece, other European states and even the United States because of its interests in the region. Cypriot Member of the European Parliament Costas Mavrides has gone further, calling for EU sanctions.

The Cypriot response reflects a broader anxiety in Nicosia. The draft would strengthen the legal background behind Türkiye's rejection of Greek Cypriot maritime claims and would reinforce the 2019 Türkiye-Libya maritime delimitation memorandum, which Ankara sees as a key legal anchor in the Eastern Mediterranean.

Energy is the next layer. ExxonMobil's reported interest in Cyprus Block 4 and Chevron's simultaneous presence in Türkiye and Greece give the bill a commercial dimension beyond sovereignty language. Türkiye was already placed under EU restrictive measures after drilling activity around Cyprus in 2019. A domestic maritime jurisdiction law would not automatically restart that confrontation, but it would give Ankara a clearer legal basis for contesting activity in zones it does not recognize.

The maritime bill also lands inside a wider Eastern Mediterranean security debate, where Ankara has increasingly linked Cyprus, Greece, Israel and regional military alignments. Bosphorus News previously reported on Foreign Minister Hakan Fidan's warning over the Greece-Cyprus-Israel axis, a backdrop that gives the draft law more strategic weight than a purely technical maritime code.

The NATO timing makes the bill even more sensitive. Türkiye will host the NATO summit in Ankara on July 7 and 8, with Ukraine, Black Sea security, defence industry cooperation and the alliance's southern flank expected to dominate the agenda. If the maritime bill advances in June, allied capitals will face a familiar dilemma: Türkiye is central to NATO's operational geography, but its maritime disputes with Greece and Cyprus remain a recurring point of friction inside the Western security architecture.

Washington has not issued a direct public position on the draft law. Bloomberg has reported that the United States is encouraging Greece and Türkiye to maintain dialogue, a cautious line that reflects the US desire to avoid a new Aegean or Eastern Mediterranean crisis before the Ankara summit.

The bill's immediate effect may therefore be legal rather than military. It does not by itself create a new crisis in the Aegean or off Cyprus. It does, however, change the texture of the dispute. Greece and Cyprus would no longer be reacting only to Turkish statements, maps, naval exercises or drilling missions. They would be responding to a maritime jurisdiction regime written into Türkiye's domestic law.

That is why the draft matters. It turns Blue Homeland from a doctrine that could be debated as political language into a legislative process that Greece, Cyprus, the EU and NATO capitals will have to follow article by article.