The Sukhoi SU-25 (Russian: Сухой Су-25, NATO reporting name: Frogfoot) is a ground-attack aircraft developed in the Soviet Union in the 1970s by the Sukhoi Design Bureau of Moscow, Russia. It first flew in 1975 and was introduced to the Soviet Air Force in 1981. It has been operated by a total of 27 countries, with 20 still using it today. The aircraft has seen a number of changes and variants over its lifetime, such as the more modern SU-25TM, specialized in anti-vehicle warfare.