The Aegean dispute is a set of interrelated controversies between Greece and Turkey over sovereignty and related rights in the region of the Aegean Sea. This set of conflicts has strongly affected Greek-Turkish relations since the 1970s, and has twice led to crises coming close to the outbreak of military hostilities, in 1987 and in early 1996. The issues in the Aegean fall into several categories: The delimitation of territorial waters, The delimitation of national airspace, The delimitation of exclusive economic zones and the use of the continental shelf, The role of flight information regions (FIR) for the control of military flight activity, The issue of the demilitarized status assigned to some of the Greek islands in the region, Turkish claims of "grey zones" of undetermined sovereignty over a number of islets, most notably the islets of Imia. One aspect of the dispute is the differing interpretations of the maritime law: Turkey has not signed up to the Convention on the Continental Shelf nor the superseding United Nations Convention on the Law of the Sea, which as of May 2022 has been signed by 168 parties, including Greece; as such, Turkey does not recognize a legal continental shelf and EEZ around the Greek islands. Between 1998 and the early 2010s, the two countries came closer to overcoming the tensions through a series of diplomatic measures, particularly with a view to easing Turkey's accession to the European Union. However, differences over suitable diplomatic paths to a substantial solution remained unresolved, and as of 2023 tensions remain. Maritime and aerial zones of influence Several of the Aegean issues deal with the delimitation of both countries' zones of influence in the air and on the sea around their respective territories. These issues owe their virulence to a geographical peculiarity of the Aegean sea and its territories. While the mainland coasts of Greece and Turkey bordering the Aegean Sea on both sides represent roughly equal shares of its total coastline, the overwhelming number of the many Aegean islands belong to Greece. In particular, there is a chain of Greek islands lined up along the Turkish west coast (Lesbos, Chios, Samos, and the Dodecanese islands), some of them in very close proximity to the mainland. Their existence blocks Turkey from extending any of its zones of influence beyond a few nautical miles off its coastline. As the breadth of maritime and aerial zones of influence,