 The Russian naval system classifies its "Kuznetsov"-class ship as a heavy aircraft-carrying cruiser because it was fitted with long-range anti-ship cruise missiles.Under the 1936 Montreux Convention, aircraft carriers heavier than 15,000 tons may not pass through the Turkish Straits.Since "Kuznetsov" exceeds the displacement limit, it would have been confined to the Black Sea if it had been classified as an aircraft carrier.