Russia Tests Two-Seat Su-57 Variant to Boost Export Potential

Russia is expanding the capabilities of its most advanced fighter jet with the development of a two-seat variant of the Su-57. Recent ground taxi trials indicate that Moscow is pivoting toward the export market, recognizing that a tandem-seat configuration is essential for foreign customers to adopt the complex fifth-generation platform.

Ground Trials and Potential Designations

On May 16, Russian military aviation blogger Ilya Tumanov, who operates the Fighterbomber Telegram channel, confirmed the existence of a new two-seat modification of the Su-57. The aircraft was photographed conducting ground taxi trials as part of its initial testing phase.

Visual evidence from Russian defense media shows a Su-57 airframe with an elongated forward fuselage, providing the necessary space for a second cockpit. This tandem configuration is a standard approach for Russian combat trainer variants.

The official nomenclature for the aircraft remains undecided. Tumanov noted that the final designation could be the Su-57D, Su-57UB, or Su-57ED. Such uncertainty is common during early-stage ground testing, as official designations are typically finalized later in the development cycle.

The Strategic Necessity of a Trainer Variant

While the single-seat Su-57 serves the Russian Aerospace Forces, the two-seat version is a strategic move aimed at international sales. According to the Russian military commentary source Voyevoda Veshchayet, “the two-seat modification is intended primarily for export.”

For foreign air forces, the transition to a fifth-generation stealth fighter is a massive undertaking. Most customer nations lack the institutional training pipelines and sophisticated simulator infrastructure available to domestic Russian crews. Providing a two-seat trainer variant allows instructor pilots to fly alongside students, making the Su-57 a practical option for nations that cannot independently sustain the training burden of a single-seat-only fleet.

Su-57 Felon: Russia’s Fifth-Generation Ambition

The Su-57, known by NATO as the “Felon,” is a twin-engine multirole stealth fighter developed by Sukhoi and produced at the Komsomolsk-on-Amur aircraft plant. The aircraft is designed to challenge the air superiority of the American F-22 Raptor, featuring:

• Low-Observable Shaping: Designed to reduce radar visibility.
• Internal Weapons Bays: To maintain stealth while carrying munitions.
• Thrust-Vectoring Engines: Enhancing maneuverability in close-quarters combat.
• Advanced Sensor Suite: For integrated situational awareness.

The aircraft entered limited service in 2020 following a development program that lasted over a decade. While Russia has sought to increase production, independent assessments have frequently questioned whether the aircraft achieves the specific radar cross-section reductions claimed by the manufacturer.

Global Reach: Algeria Becomes First Foreign Operator

Russia’s efforts to commercialize the Felon are beginning to yield results. In April 2026, the state arms export agency Rosoboronexport announced new foreign contracts for the Su-57. While the agency did not specify quantities or all customers, the announcement coincided with evidence of the aircraft’s deployment in Africa.

According to reports from the Russian state newspaper Rossiyskaya Gazeta, high-quality photographs and videos published in April 2026 show Su-57 fighters flying over Algeria bearing Algerian Air Force markings. Algerian pilots have reportedly been conducting familiarization and conversion flights, establishing Algeria as the first confirmed foreign operator of the type.

Vulnerabilities: The Impact of Ukrainian Drone Strikes

Despite its technological sophistication, the Su-57’s operational record has been marred by losses. According to Ukrainian military reporting and open-source tracking by the Oryx blog, Russia has lost at least four Su-57 aircraft since the start of the full-scale invasion.

Notably, none of these losses occurred during air-to-air combat or via surface-to-air missiles. Instead, all confirmed losses were the result of Ukrainian long-range drone strikes targeting Russian airbases deep within Russian territory.

This pattern of attrition suggests a critical vulnerability: while the aircraft may be survivable in the air, Russia has struggled to protect its most expensive and advanced assets from unmanned systems operating hundreds of kilometers inside its own borders.

Looking Ahead

The emergence of the two-seat Su-57 signals Russia’s commitment to turning the Felon into a viable export product. By lowering the barrier to entry for foreign pilots, Moscow hopes to secure the revenue and geopolitical influence that come with selling top-tier aviation technology. However, the success of these exports will likely depend on whether Russia can prove the aircraft’s survivability and provide the necessary support infrastructure to its new international partners.