Riga, Treaty of, either of two peace treaties signed at Riga, Latvia. By the Treaty of Riga of 1920, between the USSR and Latvia, the USSR recognized Latvian independence. The Treaty of Riga of 1921, between the USSR and Poland, followed a truce concluded late in 1920. The war between Poland and the USSR (1920) had been precipitated largely by the demand of Poland that its eastern border of 1772 be restored. The treaty terms, which fixed the Russo-Polish border, did not satisfy the claims of the victorious Poles, but they awarded to Poland large parts of Belorussia and of Ukraine. Nullified by the German and Soviet invasion of Poland in 1939, the treaty was replaced in 1945 by a new Soviet-Polish border agreement.
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