The production of the upgraded version of the fifth generation Su-57 fighter as part of the Megapolis research and development project is expected to begin in 2025, a source in the military-industrial sector told TASS.

"In the upgraded version of the fighter as part of the Megapolis research and development project, a completely upgraded cockpit with the most advanced avionics will be installed. In addition, the aircraft will be equipped with a second stage power unit. It is planned that mass production of the upgraded Su-57 will start from 2025," the source said.

He also clarified that as part of the Megapolis research and development project the Su-57 fighter will be made in a single-seat version. TASS has no official confirmation of this information.

Earlier, TASS reported that a fifth-generation Su-57 fighter jet will be designed in a two-seat modification to control a swarm of heavy Okhotnik combat drones.