World War I
Russia, the largest country in the world, played a crucial role in the First World War, particularly through its involvement in the Eastern Front and subsequent political changes. The war exacerbated existing social, economic, and political issues within Russia, leading to significant transformations, most notably the Bolshevik Revolution in 1917. This turmoil culminated in Russia's withdrawal from the war through the Treaty of Brest-Litovsk.
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