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The Russian conquest of Siberia, begun at the end of the 16th century, continued in the 17th century. By the end of the 1640s, the Russians reached the Pacific Ocean, the Russian explorer Semyon Dezhnev, discovered the strait between Asia and America. Russian expansion in the Far East faced resistance from Qing China. After the war between Russia and China, the Treaty of Nerchinsk was signed, delimiting the territories in the Amur region.