Erivan Khanate
The 1826–1828 Russo-Persian war resulted in another defeat for Iran. The Qajars ceded their remaining Caucasian territories: the remainder of Azerbaijan (the Nakhchivan and Lankaran Khanates) and Armenia's Erivan Khanate. Tariffs were lowered on Russian goods, and Russia could keep a navy in the Caspian Sea. The Treaty of Turkmenchay defined Russian-Iranian relations until 1917,