Teletanks were a series of wireless remotely controlled unmanned robotic tanks produced in the Soviet Union in the 1930s and early 1940s. They saw some use in combat during early World War II, referred to as the Winter War in Russia. A teletank is controlled by radio from a control tank at a distance of 500–1,500 meters, the two constituting a telemechanical group. Teletanks were used by the Soviet Red Army in the Winter War and fielded at least two teletank battalions at the beginning of the Great Patriotic War.