Sevastopol is Russia’s only true major warm-water port. However, access out of the Black Sea into the Mediterranean is restricted by the Montreux Convention of 1936, which gave Turkey – now a NATO member – control of the Bosporus. Russian naval ships do transit the strait, but in limited numbers, and this would not be permitted in the event of conflict. Even after crossing the Bosporus the Russians need to navigate the Aegean Sea before accessing the Mediterranean, and would still have either to cross the Gibraltar Straits to gain access to the Atlantic Ocean, or be allowed down the Suez Canal
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