Fighting between Russia and Ukraine in the Black Sea has picked up in recent months. The fighting is taking a toll on Russia's Black Sea Fleet, which Moscow can't reinforce. Russia's Black Sea Fleet hasn't been defeated, but its losses, including the sinking of its flagship, the Moskva, weigh more heavily on Russia's war effort because of a deal signed nearly a century ago that is preventing Moscow from bringing more ships into the Black Sea. The convention distinguishes between Black Sea powers — those with a Black Sea coastline — and non-Black Sea powers. "Initially it was thought that it was a big deal that some of the Russian warships were prevented from entering the Black Sea.

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Persons: —, Russia —, hasn't, Sergey Ponomarev, US Navy Arleigh Burke, OZAN KOSE, Ben Wallace, Stringer, Turkey's, Volodymyr Dubovyk, Dubovyk, Sabina Joja, Joja, Constantine Atlamazoglou Organizations: Montreux Convention, NATO, Service, Fleet, Sea Fleet, AP, US Navy, Getty, Russian, REUTERS, Mechnikov National University, Middle East Institute, Washington DC, Fletcher School of Law, LinkedIn, Twitter Locations: Russia, Ukraine, Moscow, Montreux, Crimea, Moskva, Sevastopol, Rostov, AFP, Turkey, Baltic, Northern, Odessa's, Ukrainian, Turkish, Romanian, Iulia, Washington, Izmail, Ankara, NATO