State Border of Ukraine

To the west Romania - Ukraine border stretches from the edge of its land segment across the Black Sea over the distance of 33 km, after that it is a boundary of the Ukrainian territorial waters and the Romanian Economic Zone.

From that point starts the Russia - Ukraine border of territorial water which stretches northward for 22.5 km (14.0 mi) towards the southern edge of the Kerch Strait.

After that the boundary continues as the Russia - Ukraine border though the Kerch Strait (49 km (30 mi)) and over the Azov Sea (249.5 km (155.0 mi)) where it divides the internal waters of both countries towards the edge of land border on the northern coast of Azov Sea.

[3] In 2004, a treaty concerning shared use of Azov Sea and the Kerch Strait was ratified by the parliaments of both countries, but left delimitation of maritime borders subject to follow-up negotiations.

[5] In 2010 following the Kharkiv Pact, Ukraine gave the Russian Sea Fleet an exclusive 25-year lease for part of the territory of Sevastopol, although this agreement was dissolved following the occupation and annexation of Crimea.

At first, Romania did not recognize Snake Island as sovereign Ukrainian territory, but later discussions regarding its ownership ceased.

Currently the dispute is settled and the Snake Island was recognized as the part of Ukrainian territory, however its adjacent waters (EEZ of Ukraine) became limited.