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The Aigun Treaty was signed by Russia and the Qing Empire on May 28, 1858 in the Manchurian town of Aigun. The purpose of the treaty was to establish a border along the Amur River. According to this treaty, Russia regained the left bank of the Amur River lost to China as a result of Nerchinsk Treaty of 1689. This treaty and the Beijing Treaty of 1860 established the modern borders of the Russian Far East.