Russia’s long-rumored twin-seat variant of the Sukhoi Su-57 may have entered early testing, signaling a potentially significant evolution of Moscow’s flagship stealth fighter program at a time when the aircraft is being aggressively marketed to India.
The first indications emerged through the widely followed FighterBomber Telegram channel, which is considered a credible source for developments linked to Russian military aviation. On May 16, the channel claimed that a twin-seat version of the Su-57 had begun taxi trials. A day later, it published an image purportedly showing the aircraft during testing.
“Today, as part of the tests, the new two-seater modification of the Su-57 performed a rollover. We’ll see if it will be called Su-57D or Su-57UB. Alternatively, it could be called Su-57ED,” Russian military aviation blogger Ilya Tumanov wrote on the FighterBomber channel.
The claims have not been independently verified, and the aircraft’s location remains unclear because the background in the published image appears intentionally blurred, likely for operational secrecy. Nevertheless, the photograph rapidly spread across social media platforms and aviation-tracking circles, where several observers argued that the aircraft appears authentic.
The aircraft shown in the image features an elongated forward fuselage with a tandem cockpit arrangement resembling that of the Sukhoi Su-30. That similarity immediately drew attention among military aviation analysts, particularly because India’s Indian Air Force operates one of the world’s largest fleets of Su-30MKI fighters.
Apart from the modified cockpit section, there appear to be few externally visible differences between the alleged twin-seat aircraft and the standard single-seat Su-57. However, noted military aviation researcher Andreas Rupprecht pointed out that the aircraft carries the bort number “055 Blue,” previously associated with the fifth flying Su-57 prototype, T-50-5.
That prototype was heavily damaged in a fire during earlier testing and later rebuilt as T-50-5R. According to Rupprecht and several other observers, Russia may have modified the rebuilt airframe into the new twin-seat demonstrator rather than constructing an entirely new prototype from scratch.
One detail that attracted particular attention was a new tail insignia reportedly depicting the Su-57 operating alongside the S-70 Okhotnik stealth drone. Analysts believe the imagery may indicate the aircraft’s intended operational role as a command platform for “loyal wingman” drones under a manned-unmanned teaming (MUMT) concept.
The possibility of such a role is not entirely new. In 2023, Russia’s United Aircraft Corporation patented what it described as a “multifunctional two-seat low-observable tactical aircraft,” widely believed to be a twin-seat Su-57 derivative.
At the time, Russian newspaper Izvestia reported that the aircraft was envisioned in three variants: a training and combat model, a strike version with a dedicated weapons operator, and a drone-control configuration designed to command formations of unmanned aircraft.
“The two-seater ‘Sukhoi’ will be produced in three versions: training and combat, shock – with an operator responsible for the use of weapons, and – for the first time in the world – as the leader of a group of heavy drones,” the report said.
If confirmed, the aircraft would become only the second known twin-seat fifth-generation stealth fighter in the world after China’s Chengdu J-20S.
The timing of the apparent unveiling is particularly notable because Russia has sharply intensified efforts to secure an Indian order for the Su-57 over the past year. Moscow has repeatedly framed the aircraft not merely as a fighter sale, but as a strategic industrial partnership involving technology transfer, local production, and support for India’s indigenous fighter ambitions.
Last year, Russia reportedly offered India what officials described as a “golden deal” centered on the Su-57. The proposal included direct delivery of completed aircraft, licensed production inside India, and technological assistance for India’s indigenous Advanced Medium Combat Aircraft, or AMCA program.
The proposal was later expanded by Rosoboronexport, which suggested leveraging India’s extensive Su-30MKI industrial infrastructure to facilitate local Su-57 production. Russian officials also highlighted the possibility of integrating Indian-made weapons and mission systems into the aircraft.
One of the most striking elements of the Russian pitch was the inclusion of a potential twin-seat Su-57 tailored to Indian operational preferences.
That aspect has generated renewed interest because India’s earlier Fifth Generation Fighter Aircraft (FGFA) project with Russia was itself envisioned as a two-seat derivative of the Su-57. India eventually withdrew from the FGFA program after expressing concerns over cost, delays, engine performance, stealth characteristics, and the aircraft’s overall maturity.
However, some Indian military analysts now believe circumstances may be changing.
Retired Indian Air Force officer and military commentator Squadron Leader Vijainder K. Thakur has argued strongly in favor of a twin-seat Su-57 acquisition, insisting that the IAF’s requirement is not simply for a stealth aircraft, but specifically for a dual-seat, twin-engine stealth platform.
“I doubt the IAF will go for the Su-57 outright. The IAF’s requirement isn’t just for a stealth fighter—it is specifically for a dual-seat, twin-engine stealth fighter,” Thakur said.
According to Thakur, the presence of a second crew member could significantly reduce pilot workload during long-range strike operations and highly networked battlespaces. A dedicated weapons systems officer could oversee sensor fusion, electronic warfare, data management, and coordination with unmanned systems while the pilot focuses on flying and tactical maneuvering.
Such a configuration would also align naturally with the IAF’s longstanding operational model. India’s large Su-30MKI fleet already employs a pilot-plus-weapons systems officer arrangement for complex missions involving deep strike, maritime attack, and air dominance roles.
Supporters of the concept argue that transitioning Indian crews from the Su-30MKI to a twin-seat Su-57 would therefore be smoother than adapting to a single-seat stealth fighter.
The proposed aircraft may also offer significant value in future drone-centric warfare environments. Russian patent documents reportedly envision the twin-seat Su-57 functioning as an airborne command node capable of coordinating mixed formations of crewed and uncrewed aircraft.
That role could prove especially relevant for India as it develops indigenous loyal-wingman drones and seeks to integrate future unmanned systems with existing platforms such as the Su-30MKI and Dassault Rafale.
Despite these arguments, India has so far maintained a cautious stance toward the Russian offer.
Air Chief Marshal A.P. Singh stated in October 2025 that the Indian defense establishment would continue evaluating all available options before making any decision regarding the Su-57.
“As far as Su-57 is concerned, I just want to say that we have to weigh all the options, and we in the defense ministry and in the Indian Air Force have a very set process of induction of any weapon system, and that process will be followed,” he said.
India has simultaneously continued negotiations for additional Rafale fighters while also exploring participation in future sixth-generation combat aircraft initiatives with foreign partners.
Still, recent comments from Hindustan Aeronautics Limited Chairman Dr. D.K. Sunil suggested that discussions with Russia remain active. Sunil disclosed last month that India was awaiting Russian quotations concerning the investment required for local production of the Su-57.
That statement reinforced the perception that New Delhi has neither fully accepted nor rejected Moscow’s proposal.
For some within India’s strategic community, the logic behind acquiring a limited number of Su-57s remains compelling. Advocates argue that the aircraft could serve as an interim capability to narrow the gap with regional competitors until the AMCA program becomes operational.
The Su-57 itself has also evolved considerably since India exited the FGFA partnership. Russia has deployed the aircraft in operational scenarios linked to the war in Ukraine, albeit reportedly in limited and carefully controlled roles. Additionally, longstanding criticisms regarding engine performance and supercruise capability are gradually being addressed through ongoing development work.
Whether the newly surfaced twin-seat aircraft can alter India’s calculus remains uncertain. Yet its emergence appears carefully timed to revive a concept that originally formed the foundation of Indo-Russian fifth-generation fighter cooperation.
For Moscow, the twin-seat Su-57 may represent more than a technical innovation. It could be the centerpiece of a renewed attempt to persuade India that the aircraft now matches the operational philosophy the IAF wanted from the beginning.
