Greece formally requested European Union intervention Thursday over what Athens characterized as systematic "unlawful fishing" by Turkish vessels in the eastern Mediterranean, the latest flare-up in decades of maritime disputes between the NATO allies.Greek Foreign Minister George Gerapetritis delivered a demarche to EU foreign policy chief Kaja Kallas, presenting documentation of what Athens claims are repeated Turkish incursions into waters under Greek jurisdiction. The complaint centers on fishing activity near several Aegean islands where maritime boundaries remain contested."This is not about fish," a senior Greek official told reporters on background. "This is about sovereignty, territorial integrity, and respect for international law. Turkey is using fishing vessels to assert claims that have no basis in the UN Convention on the Law of the Sea."Turkey rejected the allegations, with Foreign Ministry spokesman Oncu Keceli calling them "baseless provocations designed to distract from Greece's militarization of islands that should remain demilitarized under international treaties." Ankara has long argued that Greek sovereignty over certain eastern Aegean islands does not extend to expansive exclusive economic zones, given their proximity to the Turkish mainland.To understand today's headlines, we must look at yesterday's decisions. Greece and Turkey have brought their disputes to the brink of military confrontation multiple times over the past half-century. Issues range from airspace violations and territorial waters in the Aegean Sea to energy exploration rights in the eastern Mediterranean and the status of Cyprus, divided since Turkey's 1974 invasion of the island's northern third.The current dispute occurs against a backdrop of tentative rapprochement. After years of acute tension—including a 2020 naval standoff over drilling rights and frequent dogfights between Greek and Turkish fighter jets—the two countries have pursued dialogue since 2023. Talks have produced modest confidence-building measures, including military hotlines and agreements to reduce provocative rhetoric.Yet fundamental disagreements remain unresolved, and domestic political pressures in both countries incentivize nationalist posturing. Greek Prime Minister Kyriakos Mitsotakis faces criticism from opposition parties that accuse him of weakness toward Ankara, while Turkish President Recep Tayyip Erdoğan has consistently framed territorial disputes as matters of national honor and historical rights.The fishing dispute places the European Union in a familiar dilemma. Greece is an EU member and invokes European solidarity in its conflicts with Turkey. Turkey, while a NATO ally and formal EU accession candidate, has seen its membership bid frozen for years over rule of law concerns and unresolved territorial disputes with Greece and Cyprus.Brussels has historically attempted to balance support for Greece with pragmatic engagement with Turkey, whose cooperation is essential on migration management, counterterrorism, and regional security. The bloc imposed limited sanctions on Turkish energy companies in 2020 during the drilling rights crisis but has been reluctant to escalate measures that might push Ankara further from the Western orbit and closer to Russia or China."The EU's response will be carefully calibrated," said Senem Aydin-Düzgit, senior scholar at the Istanbul Policy Center. "Strong enough to satisfy Athens but not so aggressive that it forecloses dialogue with Turkey. Expect expressions of concern, calls for restraint, and an offer to facilitate talks—the standard European playbook."The timing of the Greek appeal is noteworthy. EU foreign ministers are scheduled to meet next week in Brussels to discuss security issues, providing a platform for Athens to press its case. Greek officials have indicated they will seek a formal EU statement condemning Turkish actions and potentially threatening measures if violations continue.Turkish officials dismissed the notion that EU pressure would alter their behavior. "Turkey defends its rights and those of Turkish Cypriots," Foreign Minister Hakan Fidan said in parliamentary remarks. "We are not intimidated by threats or one-sided European statements that ignore the legitimate interests of 85 million Turks."The fishing dispute also intersects with broader energy politics in the eastern Mediterranean. The discovery of substantial natural gas reserves off the coasts of Cyprus, Israel, and Egypt has triggered competition for exploration and extraction rights. Turkey claims portions of these waters based on agreements with the Turkish Republic of Northern Cyprus, which only Ankara recognizes.