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The Polish–Soviet War (February 1919–March 1921) was an armed conflict between Soviet Russia and...

The Polish–Soviet War (February 1919–March 1921) was an armed conflict between Soviet Russia and Soviet Ukraine against the Second Polish Republic and the Ukrainian People's Republic, four states in post-World War I Europe. The war was the result of the belligerents' desire to expand their territories and their influence over them. Poland, whose statehood had just been re-established by the Treaty of Versailles following the Partitions of Poland in the late 18th century, sought to secure territories it had lost at the time of partitions; the aim of the Soviet states was to control those same territories, which had been part of the Russian Empire until the turbulent events of World War I. The question of victory is not universally agreed on. The Poles claimed a successful defense of their state, while the Soviets claimed a repulse of the Polish eastward invasion of Ukraine and Belarus, which they viewed as a part of the foreign intervention in the Russian Civil War. The frontiers between Poland and Soviet Russia had not been defined in the Treaty of Versailles and post-war events created turmoil: the Russian Revolution of 1917; the crumbling of the Russian, German and Austrian