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 <answer>the Entente</answer>, 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.
What alliance defeated the German Empire in World War I?
the Entente