Ukraine navy chief says Russia is losing Crimean hub in Black Sea ReutersWho needs warships when you’ve got drones? Russia loses control over Black Sea Kyiv IndependentWhat’s the latest on the battle in Crimea between Ukraine and Russia? Le Monde NATO studying Ukraine’s experience in Black Sea to adapt to changes of modern combat – admiral UkrinformFour lessons on sea denial from the Black and Red seas NavyTimes.com