Turkmanchai, Treaty of (tŏrkmänchĪˈ) [key], 1828, agreement signed by Russia and Persia at the village of Turkmanchai (Torkaman), East Azerbaijan prov., NW Iran. It concluded the Russo-Persian war that had begun in 1825 and forced Persia to cede part of Persian Armenia to Russia and to grant extraterritorial rights.
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