The return of Khoy to the central government of Iran was during the beginning of Qajar period during Agha Mohammad Khan's reign. Khoy was attacked in 1827 by the Russian Empire who was attempting to seize the last of the Caucasian territories of Iran comprising Armenia and what is now Azerbaijan during the Russo-Persian War (1826–1828). The war, which mainly razed in the extremely nearby South Caucasus region eventually happened to moved deeper south as well. Until 1828, Khoy had a large number of Armenians, however, the Treaty of Turkmenchay following the outcome of the 1826–1828 war and the victory over the neighbouring Ottoman Empire as concluded in the Treaty of Adrianople, encouraged the mass resettlement of Armenians from both Turkey and Iran in the Russian-controlled territory of modern Armenia. In the mid-1800s some of them immigrated to eastern Armenia, which by then had just become part of the Russian Empire. However, a small Armenian population remains living in Khoy city and county. Eli Smith notes in his "Missionary Researches in Armenia: Including a Journey through Asia Minor, an into Georgia and Persia" released in 1834 that he and his group had heard while passing through Khoy that the city had between 4000 and 7000 Muslim families, while only about 100 Armenian families were left. He noted further that in the immediate villages around Khoy city there were a few more Armenians, but the vast majority had migrated to the North of the Aras river following Russia's victory over Persia in 1828 and the encouraged settling in the newly incorporated Russian regions of Eastern Armenia. In 1911 Khoy was occupied by Ottoman troops, followed in World War I by Russian troops, who withdrew in 1917. In World War II it was again occupied by Soviet troops, who remained until 1946. Today, Khoy County is mainly populated by both Azeris and Kurds. Nature Khoy is located in the mountains, so the weather is very cold in winter and cool in summer. Spring weather in this city is very pleasant. The city is located in the vicinity of mountains such as Chelekhaneh Mount and Avrin Mount (The highest mountain of West Azarbaijan Province). Khoy was fortified at various times in its history, most recently by the Qajar dynasty in the Nineteenth Century. Transportation Airlines and destinations Khoy Airport is an airport and Bus station in Khoy, Iran. Bus terminals A bus terminus