Convoys to northern Russia continued through May 1945. By this time, however, more supplies had been transported to her using other routes, including the northern Pacific route. After Turkey declared war on Germany in February 1945, a route through the Black Sea strait opened up that supplanted the Persian corridor route. Summarizing the results of the Arctic convoys to northern Russia during the war, 720 ships in 40 outbound convoys arrived safely delivering about 5,000 tanks and over 7,000 aircraft. Ninety-two merchantmen and 18 escorting warships were lost due to enemy action. In return, the Allies sank a German battleship, three destroyers and 38 U-boats.