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Myrny (Ukraine) (AFP) - Russia has deliberately sunk three of its own ships to block Ukrainian navy vessels entering a lake off the Black Sea, officers say, highlighting Moscow's determination to wear down the morale of Kiev's forces in Crimea. The Ochakov -- a Soviet-era warship decommissioned in 2011 and set to be sold for scrap -- was towed to the entrance to Lake Donuzlav on Crimea's western coast from the Russian base at Sevastopol on Thursday and blown up. Ukraine's navy has limited resources and suffered a major blow last week when its chief Denis Berezovsky switched allegiance to the pro-Russian Crimean authorities and a new chief was appointed. "It is blocked so we cannot get out," said Captain Viktor Shmyganovsky, second-in-command at the base in Novoozerne, one of the four biggest in Crimea.