Kharkiv, or Kharkov, is the second-largest city of Ukraine. Located in the north-east of the country, it is the largest city of the Slobozhanshchyna historical region. By its territorial expansion on September 6, 2012 the city increased its area from about 310 to 350 square kilometres.The city was founded in 1654 and was a major centre of Ukrainian culture in the Russian Empire. Kharkiv was the first city in Ukraine to acknowledge Soviet power in December 1917 and later became the capital of the Ukrainian Soviet Socialist Republic. Kharkiv remained the capital of the Ukrainian SSR until January 1934, when it was moved to Kiev. It is the administrative centre of the Kharkiv Oblast as well as the administrative centre of the surrounding Kharkiv district, while the city itself has a special status within the region. As of 2006, its population was 1,461,300.Kharkiv is a major cultural, scientific, educational, transport and industrial centre of Ukraine, with 60 scientific institutes, 30 establishments of higher education, 6 museums, 7 theatres and 80 libraries. Its industry specialises primarily in machinery and electronics. There are hundreds of industrial companies in the city. Among them are globally important giants like the Morozov Design Bureau and the Malyshev Tank Factory; Khartron; and the Turboatom turbines producer.There is an underground rapid-transit system with about 38.1 km of track and 29 stations. A well-known landmark of Kharkiv is the Freedom Square, which is the sixth largest city square in Europe, and the 12th largest square in the world.Kharkiv was a host city for the UEFA Euro 2012, and hosted three group matches in Metalist Stadium.