Erivan Khanate
In 1826, in violation of the Gulistan treaty, the Russians occupied parts of Iran's Erivan Khanate. This sparked the final bout of hostilities between the two; the Russo-Persian War of 1826-1828. In the subsequent war that raged, (Russo-Persian War, 1826-1828), the Qajarid Iranians suffered an even bigger disaster, as Russia occupied as far as Tabriz in mainland Iran. At the end of the war, in 1828, with the Treaty of Turkmenchay, Iran was forced to cede its territories comprising the Erivan khanate (comprising modern-day Armenia), the Nakhichevan Khanate, as well as the remainder of the Republic of Azerbaijan that had not been ceded forcefully in 1813. By this time, in 1828, the century-long Iranian rule over Eastern Armenia had thus officially come to an end.