Ukraine claims sinking of Russia submarine in Sevastopol POLITICO EuropeRussian Black Sea Fleet Submarine Destroyed in Crimea Strike NewsweekIt’s Possible A Ukrainian Missile Blew Up Russia’s ‘Rostov-On-Don’ Submarine—For The Second Time In 11 Months ForbesRussian submarine sunk in Crimean port, Ukraine claims CNNUkraine says it sank Russian submarine, hit airfield, oil depots Reuters