Ukraine is the only one of those smaller states that didn't break away from the Soviet Union.
Ukraine is a country in Eastern Europe. Ukraine has a population of about 42.5 million, making it the 32nd most populous country in the world. Its capital and largest city is Kiev.
The Soviet Union had its origins in the Russian Revolution of 1917. It was officially the Union of Soviet Socialist Republics[c] (USSR). It was a socialist state in Eurasia that existed from 1922 to 1991.