Sino-Russian border conflicts

The Sino-Russian border conflicts (1652–1689) were a series of intermittent skirmishes between the Qing dynasty of China, with assistance from the Joseon dynasty of Korea, and the Tsardom of Russia by the Cossacks in which the latter tried and failed to gain the land north of the Amur River with disputes over the Amur region. The hostilities culminated in the Qing siege of the Cossack fort of Albazin in 1686 and resulted in the Treaty of Nerchinsk in 1689 which gave the land to China.

Source: Wikipedia — Sino-Russian border conflicts (CC BY-SA 4.0)