So, it turns out the two-seat Su-57D does exist!

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The first test flight of the prototype of the fifth-generation two-seat fighter Su-57 has taken place, reported First Deputy Prime Minister of Russia Denis Manturov.

"Flight tests of the prototype of the fifth-generation two-seat fighter Su-57 have begun. This aircraft, initiated by our aircraft manufacturers, in addition to its unique combat characteristics, will also have the functionality of a combat trainer aircraft and the capabilities of a battle management aircraft."

The aircraft was flown by Hero of Russia test pilot Sergey Bogdan. The flight proceeded normally in accordance with the flight mission conditions.

"Today, our aircraft manufacturers are ensuring unprecedented production volumes of aircraft needed by the troops and are continuously working on the development of modern aviation systems. The two-seat Su-57 variant, created by specialists of the Sukhoi Design Bureau, can be used not only for pilot training but also for the organization and control of combat operations of a joint group of manned and unmanned aviation, forming a unified information and control space," Rostec said.

According to Manturov, the new Su-57 "in addition to its unique combat characteristics, will also have the functionality of a combat trainer aircraft and the capabilities of a battle management aircraft."