New countries by the Baltic Sea (Estonia, Finland, Latvia, and Lithuania) were also created in other treaties after World War I. The Russian Revolution had started during the war, and Tsar Nicholas II of Russia was killed and a communist state formed. A civil war raged in Russia between the anticommunist Whites and the communist Reds. Russia had lost control of its western territory (Estonia, Finland, Latvia, Lithuania, and parts of Poland). Later, during World War II, the Soviet Union took over Estonia, Latvia, Lithuania, and half of Poland.