Russia Begins Construction of Redesigned Su-75 Checkmate Fifth-Generation Fighter Prototype.

Russia has confirmed that the Su-75 Checkmate program has entered prototype construction, marking the first tangible step toward a flyable fifth-generation fighter after years of concept displays and promotional presentations. Announced on June 2, 2026, through Russian state news agency TASS, the development is significant because it could provide Moscow with a lower-cost stealth combat aircraft to complement the Su-57 while expanding its future fighter force structure.

The experimental aircraft is expected to validate a revised design that combines low-observable features, internal weapons carriage, advanced avionics, and potential technologies derived from the Su-57 program. If testing succeeds, the Checkmate could support both domestic airpower modernization and future manned-unmanned teaming concepts, reflecting the broader shift toward more affordable and flexible next-generation combat aviation.

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Russia has begun building an experimental prototype of the redesigned Su-75 Checkmate, marking the fighter's transition from a concept model to a testable fifth-generation combat aircraft with both domestic and export ambitions (Picture Source: Sukhoi / Russia's Federal Service for Intellectual Property / Edited by Army Recognition Group). © Army Recognition Group. All rights reserved. Unauthorized use, reproduction, or distribution prohibited.

On June 2, 2026, Russia confirmed that work on the Su-75 Checkmate fifth-generation fighter has reached the stage of building an On June 2, 2026, Russia confirmed that work on the Su-75 Checkmate fifth-generation fighter has reached the stage of building an experimental prototype. According to Russian state news agency TASS, Vadim Badekha, CEO of PJSC United Aircraft Corporation, which is part of Rostec, said that the start of production of a modern single-engine fifth-generation fighter is very important for Russia. His statement, made in response to a question about when Su-75 Checkmate deliveries to the troops could be expected, suggests that the program is moving beyond the promotional mock-up phase. For Moscow, the development is relevant because Russia has been absent from the modern single-engine fighter market for decades, despite the Soviet Union having produced several tens of thousands of single-engine combat aircraft.

The Su-75 Checkmate, also known in Russia as the LTS, or Light Tactical Aircraft, and associated with Sukhoi’s T-75 internal designation, is being developed as a single-engine low-observable multirole fighter positioned below the heavier Su-57. Its concept is based on reduced radar signature, internal weapons carriage, digital flight-control systems, modular avionics, artificial intelligence assistance, and lower acquisition and operating costs compared with larger twin-engine platforms. In Russian military-industrial terminology, the aircraft is intended to revive the category of the legky taktichesky samolyot, a light tactical aircraft designed to complement heavier combat aircraft rather than replace them. This positioning is central to the Checkmate concept, as it seeks to offer part of the fifth-generation capability set in a lighter, cheaper, and potentially exportable package.

The TASS report is significant because it confirms that work on Checkmate has entered the construction stage of an opytny obrazets, or experimental prototype. In Russian aerospace practice, this step is not equivalent to immediate delivery to the Russian Aerospace Forces, or VKS, but it marks a transition toward ground testing, systems integration, and eventual flight trials. Before any first flight, the prototype must undergo a sequence of bench and rig tests, including powerplant installation, engine start-up checks, avionics validation, electrical and hydraulic system verification, flight-control software testing, fuel-system checks, and structural assessments. These procedures will be particularly important for the Su-75 because the aircraft is expected to integrate low-observable shaping, internal weapon bays, a single-engine layout, and potentially technologies derived from or associated with the Su-57 program.

The Su-75 has so far been known mainly through the full-scale mock-up unveiled at MAKS 2021, later international presentations, patents, and digital promotional material. Initial Russian statements had suggested an ambitious development timeline, but the program later slipped, with its first flight and production outlook pushed back. The latest confirmation that Russia is building a prototype indicates that Sukhoi and UAC are attempting to move the aircraft from an airshow concept to a testable combat aviation platform. However, the absence of a confirmed delivery schedule to the troops shows that the program remains in the development phase, and that serial production will depend on the results of ground tests, flight trials, weapons integration, and industrial readiness.

The prototype now under construction may also provide the first indication of how far Sukhoi has moved beyond the Su-75 configuration publicly displayed in 2021. While the TASS announcement confirms the construction of an experimental prototype, additional design material revealed in 2023 by Russia’s Federal Service for Intellectual Property showed a series of patents submitted by the Sukhoi Design Bureau for a new configuration of the aircraft. These filings pointed to changes in the rear fuselage, enlarged flaperons along the rear wing edge, slightly extended leading-edge root extensions, and modified outer wing panels that appeared to draw on aerodynamic logic already used in the Su-57 program. In aviation terms, these changes are not cosmetic: they could affect lift generation, pitch and roll authority, high-angle-of-attack behavior, internal volume distribution, rear-aspect radar signature, and the overall balance between aerodynamic efficiency and low observability. If the prototype reflects these refinements, it would mean that Sukhoi is using the experimental aircraft not only to validate the Checkmate’s systems, but also to test a more mature aerodynamic configuration before entering the demanding sequence of ground trials, taxi tests, first flight, envelope expansion, and weapons-integration work. Such a path would be consistent with a normal fighter development cycle, in which an early public demonstrator is progressively reshaped after computational fluid dynamics work, wind-tunnel data, structural analysis, customer feedback, production engineering studies, and evolving VKS or export requirements.

Compared with the Su-57, the Su-75 follows a different operational and economic logic. The Su-57 is a twin-engine heavy fighter with greater internal volume, payload capacity, range potential, and propulsion redundancy, making it better suited for higher-end missions requiring long-range operations, advanced sensor employment, and larger weapons loads. The Su-75, by contrast, is intended to be a lighter and more affordable low-observable fighter capable of performing air defense, tactical strike, and multirole missions at lower cost. Its single-engine configuration may reduce maintenance requirements and life-cycle expenses, but it also places greater importance on engine reliability, systems integration, and production quality. If successful, Checkmate could give Russia a lower-cost complement to the Su-57 and help the VKS build a more flexible fifth-generation force structure.

The aircraft also carries an export logic. Badekha also indicated that the aircraft is being developed both for the Russian Ministry of Defense and potential foreign customers, while delivery timelines will depend on customer interest, mission requirements and work with future operators. He also noted that the Russian Defense Ministry is seeking to reduce the final cost of the aircraft, reinforcing the central logic of the single-engine configuration. Russia has traditionally used combat aircraft as instruments of defense diplomacy, offering platforms to customers seeking alternatives to Western systems. The Su-75 is clearly shaped for this role, as it targets countries that may want a fifth-generation fighter but cannot access, afford, or politically accept aircraft such as the F-35. Its appeal would depend on a combination of price, operational performance, weapons compatibility, ease of maintenance, and freedom from Western procurement restrictions. However, Russia will have to demonstrate that the aircraft can be produced reliably under sanctions and that its avionics, radar, engine, mission systems, and weapons integration can meet the expectations of potential foreign operators.

The uncrewed dimension of the Checkmate program adds a strategic layer that could become increasingly important as the prototype phase advances. At Dubai Airshow 2025, UAC displayed a cockpit-less mock-up, indicating that Sukhoi was already studying configurations beyond a conventional manned fighter. This presentation suggested possible unmanned or optionally manned variants, with the aircraft potentially serving as a loyal wingman, remote weapons carrier, expendable strike asset, or forward sensor node operating alongside crewed platforms such as the Su-57. In operational terms, such a concept would allow Russia to explore manned-unmanned teaming, in which a crewed fighter controls or coordinates lower-cost unmanned combat aircraft to extend sensor coverage, saturate air defenses, conduct reconnaissance, or strike targets in heavily defended airspace without exposing a pilot. The approach also reflects a broader global shift toward collaborative combat aircraft, as air forces seek systems that are cheaper than manned fifth-generation fighters but capable of carrying sensors, electronic warfare payloads, precision weapons, or decoys. Sukhoi has also presented an unmanned version of the Su-75 whose design appears closer to the reshaped configuration revealed after 2023, reinforcing the possibility that Checkmate is being developed as more than a single manned fighter design. If this trajectory continues, the Su-75 could become the basis for a broader tactical aviation family combining crewed fighters, optionally manned variants, uncrewed derivatives, and collaborative combat aircraft concepts adapted to Russian VKS requirements and export demand.

The Su-75 serves several Russian objectives at once. Militarily, it could provide the VKS with a lighter fifth-generation aircraft to complement the Su-57, legacy Su-30SM, Su-34, and Su-35 fleets, while also supporting future manned-unmanned teaming concepts. Industrially, it helps Sukhoi, UAC, and Rostec preserve engineering expertise in low-observable combat aircraft design at a time when Russia’s aviation sector faces sanctions, wartime demand, and supply-chain constraints. Geopolitically, the program allows Moscow to signal that it remains active in the next-generation fighter market despite the pressure created by the war in Ukraine and Western technology restrictions. In this sense, the Checkmate is not only an aircraft project, but also a message about Russian defense-industrial resilience.

The revival of a modern single-engine fighter is also symbolically important for Russia. As Badekha noted in his TASS interview, the Soviet Union produced several tens of thousands of single-engine combat aircraft, but Russia moved away from this segment over recent decades. The Su-75 represents an attempt to return to a category once central to Soviet airpower, including aircraft families such as the MiG-21, MiG-23, MiG-27, and Su-17. Unlike those Cold War designs, the Checkmate is being promoted as a fifth-generation platform with reduced observability, digital systems, internal payload options, and potential uncrewed variants. This creates a bridge between Russia’s historical experience with mass-produced single-engine fighters and its current ambition to compete in the modern low-observable combat aircraft market.

The Su-75 Checkmate remains a program of potential rather than proven capability, but the construction of an experimental prototype marks a relevant step beyond the airshow phase. If the aircraft now being assembled reflects Sukhoi’s revised design, the next public appearance or test campaign could reveal a different Checkmate from the one previously displayed. For Russia, the challenge is no longer only to promote an affordable fifth-generation fighter, but to prove that Sukhoi can stabilize the configuration, complete bench and flight testing, integrate modern sensors and weapons, and move toward dependable production. The prototype now under construction will determine whether the Su-75 becomes a real combat aircraft, a future uncrewed platform, or another ambitious aerospace project slowed by industrial limits and geopolitical pressure.. According to Russian state news agency TASS, Vadim Badekha, CEO of PJSC United Aircraft Corporation, which is part of Rostec, said that the start of production of a modern single-engine fifth-generation fighter is very important for Russia. His statement, made in response to a question about when Su-75 Checkmate deliveries to the troops could be expected, suggests that the program is moving beyond the promotional mock-up phase. For Moscow, the development is relevant because Russia has been absent from the modern single-engine fighter market for decades, despite the Soviet Union having produced several tens of thousands of single-engine combat aircraft.

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Written by Teoman S. Nicanci – Defense Analyst, Army Recognition Group

Teoman S. Nicanci holds degrees in Political Science, Comparative and International Politics, and International Relations and Diplomacy from leading Belgian universities, with research focused on Russian strategic behavior, defense technology, and modern warfare. He is a defense analyst at Army Recognition, specializing in the global defense industry, military armament, and emerging defense technologies.