Treaty of Aigun
The treaties of Nerchinsk and Kyakhta were the basis of Russo-Chinese relations until the Treaty of Aigun in 1858. The fixed border helped the Chinese to gain full control of Outer Mongolia and annex Xinjiang by about 1755. Russo-Chinese trade shifted from Nerchinsk to Kyakhta and the Nerchensk trade died out by about 1750. (Local trade in this area shifted east to a border town called Tsurukhaitu on the Argun River).