Given the question: Information: - The Tatars are a Turkic people living in Asia and Europe who were one of the five major tribal confederations ("khanlig") in the Mongolian plateau in the 12th century CE. The name "Tatar" first appears in written form on the Kul Tigin monument as ("TaTaR"). Historically, the term "Tatars" was applied to a variety of Turco-Mongol semi-nomadic empires who controlled the vast region known as Tartary. More recently, however, the term refers more narrowly to people who speak one of the Turkic languages. - The Archa Darugha ( Tatar : Arca daruas ) was a subdivision of the Kazan Khanate and the Kazan Uyezd in 16th - 18th centuries . The center was the town of Archa . Its territory covered the basins of the Kazanka , Noqsa , Kinderle , Shapshe , Yamashirma , Norma , Kesmas , Qrlay , Kultas , Sarapul , Vyatka , Shushma , Sarda etc. rivers . For the most part , the possessions of Prikaz of Kazan Palace , monasteries and Serving Tatars were placed there in the 16th - 18th centuries . ( Tatar ) '' Arca daruas / '' . Tatar Encyclopaedia . Kazan : The Republic of Tatarstan Academy of Sciences . Institution of the Tatar Encyclopaedia . 2002 . - Kesma is a rural locality (a "selo") in Vesyegonsky District of Tver Oblast, Russia. - Russia (from the Rus'), also officially known as the Russian Federation, is a country in Eurasia. At , Russia is the largest country in the world by surface area, covering more than one-eighth of the Earth's inhabited land area, and the ninth most populous, with over 140million people at the end of March 2016. The European western part of the country is much more populated and urbanised than the eastern, about 77% of the population live in European Russia. Russia's capital Moscow is one of the largest cities in the world, other major urban centers include Saint Petersburg, Novosibirsk, Yekaterinburg, Nizhny Novgorod and Samara. - Izhevsk ("Iz", or , "Izkar") is the capital city of the Udmurt Republic, Russia, located along the Izh River in the Western Urals. Its population is629,455 (2012 est.), up from627,734 recorded in the 2010 Census, making it the nineteenth largest city in Russia and the largest in the republic. - Serving Tatars were a class of ethnically Tatars state servants in Muscovy and Russia in 14th-18th centuries. - Sarapul (Udmurt and ) is a city and a river port in the Udmurt Republic, Russia, located on the right bank of the Kama River, southeast of Izhevsk, the capital of the republic. Population: What entity does 'archa darugha' has the relation 'official language' with?
The answer is:
russian