Cyprus and Turkey maritime sovereignty disputes

Tensions regarding maritime sovereignty and research rights in the Eastern Mediterranean have escalated through legal and diplomatic channels. In October 2026, the Republic of Cyprus filed a formal complaint with the United Nations, accusing Turkey of violating its sovereignty and sovereign rights. Cyprus reported that the Turkish research vessel “Akdeniz Arastirma 1” conducted unauthorized water sampling operations within Cypriot territorial waters, the Exclusive Economic Zone, and the continental shelf during June and August 2026.

By November 2026, the dispute expanded to include activities related to the Great Sea Interconnector project. Turkey formally contested the planned research activities of the French vessel Abeille Marengo, which is intended to support a cable-laying project. Turkey canceled maritime safety notices issued by Greece and the Greek Cypriot administration, maintaining that the mission is unauthorized because the necessary consent for work within its declared continental shelf has not been completed.

Further legal action was taken by Cyprus in November 2026, when Permanent Representative Maria Michail submitted a formal letter to UN Secretary-General Antonio Guterres. This complaint protests unauthorized underwater research and operations conducted by several Turkish-flagged vessels, including the Oruç Reis, Denar Pathfinder, Denar Echo, and Kirici, between October 1 and October 25, 2026. The Cypriot government asserts these activities, which are reportedly linked to a planned natural gas pipeline between Turkey and the occupied areas of Cyprus, violate its jurisdiction under the United Nations Convention on the Law of the Sea.