The German Empire conquered Ukraine during World War I and was planning on either annexing it or installing a puppet king, but was defeated by the Entente, with major involvement by the Ukrainian Bolsheviks. After conquering the rest of Ukraine from the Whites, Ukraine joined the USSR and was enlarged (gaining Crimea and then Eastern Galicia), whence a process of Ukrainization was begun, with encouragement from Moscow.
During which war did the Ukraine conquer the German Empire?