quality:corruption
Tula is the largest city and the administrative center of Tula Oblast in Russia, located 193 kilometers (120 mi) south of Moscow. Tula is located in the northern Central Russian Upland on the banks of the Upa River, a tributary of the Oka. At the 2010 census, Tula had a population of 501,169, an increase from 481,216 in 2002, making it the 32nd-largest city in Russia by population.A primarily industrial city, Tula was a fortress at the border of the Principality of Ryazan. The city was seized by Ivan Bolotnikov in 1606 during the Time of Troubles and withstood a four-month siege by the Tsar's army. Historically, Tula has been a major centre for the manufacture of armaments. The Demidov family built the first armament factory in Russia in the city, in what would become the Tula Arms Plant, which still operates to this day. Tula is home to the Klokovo air base, Tula State University, the Tula Kremlin, Tula State Museum of Weapons, and Kazanskaya Embankment. Tula has a historical association with the samovar, a metal container used to heat and boil water; the city was a major center of Russian samovar production. Yasnaya Polyana, the former home of the writer Leo Tolstoy, is located 12 kilometres (7.5 mi) southwest of Tula. Additionally, Tula is known for its imprinted gingerbread (pryanik), which has been made in Tula since the 17th century.