people in the cities demonstrated over food shortages
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Revolution, perhaps.
russia
Are you referring to WW1? Then it was because of the beginning of the October Revolution (Lenin's Communist revolution in 1917).
The communist revolution in russia in 1917
Russia did pull out of the war, in 1917. They suffered from a revolution, which overthrew the Tsar, and then a second revolution later in 1917 brought the communists to power. They would eventually take over and rule until 1991.