Su-39 (Su-25TM, factory — T8TM) - is a modification of the Su-25 attack aircraft[​1]. The aircraft was developed in the late 1980s by the Sukhoi Design Bureau and is designed for use at any time of the day.

In 1995, the development of a weapon control system, which received the designation SUO-39P, was started at the Aviautomatics Design Bureau. Flight tests of the new equipment at the GLITZ MO began on October 21, 1998 (the T 8TM-4 machine, the first flight on March 25, 1998).

The Su-39 aircraft represented a further development of a specialized "anti-tank" version of the Su-25T attack aircraft. The task of fighting tanks for the Su-39 was supposed to be important, but not dominant, like the Su-25T. It was assumed that the aircraft would be able to effectively destroy ships in coastal zones, enemy transport and front-line aircraft[​3]. The aircraft's weapons complex and avionics have undergone significant processing.