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Treaty of Riga, (1921) treaty between Poland and Russia signed in Riga, Latvia, that ended the Russo-Polish War of 1919–20 and set their mutual border. The treaty, which gave Poland parts of Belorussia (now Belarus) and Ukraine, lasted until World War II, after which a new treaty established a new border.

This article was most recently revised and updated by Maren Goldberg.
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