Bratsk Airport (Russian: Аэропорт Братск) (IATA: BTK, ICAO: UIBB) is an airport in Irkutsk Oblast, Russia, located 8 kilometres (5 mi) north of Bratsk. It is a mixed use airfield, providing 32 parking spaces for medium-sized airliners. Bratsk Airport serves as a diversion airport on Polar route 2. It is described as an international airport, although currently it only serves internal flights in Russia. The 350 IAP (350th Interceptor Aviation Regiment) began in 1984 with a number of Tupolev Tu-128 (Fiddler) aircraft. Bratsk was responsible for air defense of most of the Siberian interior region and depended on the long-range capability of the Tu-128 to cover this vast territory. By the 1990s, the unit had been upgraded with MiG-31 jets.