number of encounters between the Russian and Ottoman navies in the Black Sea. The Ottomans initially had the advantage due to having under their command the German battlecruiser , but after the two modern Russian dreadnoughts and had been built in Mykolaiv, the Russians took command of the sea until the Russian government collapsed in November 1917. German submarines of the Constantinople Flotilla and Turkish light forces would continue to raid and harass Russian shipping until the war's end. In 1918, some elements of the fleet were interned by the Central Powers as a result of their advance into South Russia. In the April Crimea operation, the goal of both Ukrainians and Germans was to get control over the Black Sea Fleet, anchored in Sevastopol. Former Chief of Staff Mikhail Sablin raised the colours of the Ukrainian National Republic on 29 April 1918, and moved a portion of the Ukrainian fleet (two battleships and fourteen destroyers) to Novorossiysk in order to save it from capture by the Germans. He was ordered to scuttle his ships by Lenin but refused to do so. Most ships returned to Sevastopol, where they first came under German control. In November 1918 they came under Allied control who later gave the ships to Wrangel's fleet of the Whites. In 1919, following the collapse of the Central Powers' occupation in Western Russia, the Red Fleet of Ukraine was established out of certain remnants of the Russian Imperial Fleet. However, subsequently these elements were either scuttled or captured by the Western Allies. During the ensuing Russian Civil War, the chaotic political and strategic situation in southern Russia permitted the intervening Western allies to occupy Odessa, Sevastopol and other centres with relative ease. Most of the ships of the Black Sea Fleet became part of the "Russian Squadron" of Wrangel's armed forces. Following the defeat of anti-Bolshevik forces and the evacuation of Crimea by White forces, the fleet itself sailed to Tunisia. Out of those ships, some passed to the French Navy while others were sold as scrap. Soviet Navy With the defeat of the anti-Bolshevik Armed Forces of South Russia, the Soviet government took control of all naval elements. The few ships that remained in the Black Sea were scrapped in the 1920s and a large scale new construction programme began in the 1930s. Over 500 new ships were built during that period and a massive expansion