The republic was proclaimed during the Bolshevik invasion of Ukraine immediately before Bolshevik forces pushed the Ukrainian government out of Kiev and Sfatul Țării proclaimed the independence of the Moldavian Democratic Republic. The Odessa Soviet's governing body was the "Rumcherod", formed in May 1917 shortly after the February Revolution. After its Second Congress, the OSR's Soviet was chaired by Vladimir Yudovsky. He had been installed after a pro-Bolshevik coup d'état organized by the Narkom Nikolai Krylenko.