In 1649–50 Yerofey Khabarov became the second Russian to explore the Amur River. Through Olyokma, Tungur and Shilka Rivers he reached Amur (Dauria), returned to Yakutsk and then back to Amur with a larger force in 1650–53. This time he was met with armed resistance. He built winter quarters at Albazin, then sailed down Amur and found Achansk, which preceded the present-day Khabarovsk, defeating or evading large armies of Daurian Manchu Chinese and Koreans on his way. He charted the Amur in his "Draft of the Amur river". Subsequently, Russians held on to the Amur Region until 1689, when by the Treaty of Nerchinsk this land was assigned to Chinese Empire (it was returned, however, by the Treaty of Aigun in 1858).