Treaty of Aigun
Later, in 1727, the Treaty of Kiakhta fixed what is now the border of Mongolia west of the Argun and opened up the caravan trade. In 1858 (Treaty of Aigun) Russia annexed the land north of the Amur and in 1860 (Treaty of Beijing) took the coast down to Vladivostok. The current border runs along the Argun, Amur and Ussuri rivers.