Key Points and Summary – Russia’s Su-57 “Felon” has earned an infamous reputation as the worst 5th-generation fighter, and a new analysis breaks down its five fatal flaws.
-The program is crippled by extremely low production numbers, a critical reliance on outdated engines, and a stealth design that is considered inferior to its Western rivals.
Su-57 Felon Fighter Russian Ministry of Defense Photo
-Furthermore, its avionics and sensor fusion capabilities lag significantly behind the F-35, and it has been a complete failure on the international export market, with even India backing out.
-These combined failures make the Su-57 a strategically limited and deeply troubled aircraft.
Russia’s Su-57 Felon Fighter: No Match for the F-35
The Sukhoi Su-57 Felon, Russia’s first fifth-generation stealth fighter, has already had a troubled history.
From constant delays to limited deployment, the Su-57 has garnered an infamous reputation among aviation experts as the worst fifth-generation fighter in use today.
While some of the claims are often hyperbolized, the fighter has a number of issues that make it inferior to its Western counterparts, like the F-35.
Production Issues
One of the most glaring issues with the Su-57 is its limited production and deployment. Although the aircraft was first introduced to the public in 2010 and officially entered service in 2020, the number of operational units remains extremely low. As of mid-2025, only a small fleet of Su-57s is believed to be in active service with the Russian Aerospace Forces.
This slow production rate has raised questions about the program’s sustainability and effectiveness. In contrast, the United States has produced hundreds of F-35s, which are now in service with multiple allied nations. The Su-57’s limited numbers reduce its strategic impact and make it difficult to integrate into Russia’s broader military doctrine in a meaningful way. Moreover, the low production volume suggests ongoing issues with manufacturing, funding, or both; factors that could undermine the aircraft’s long-term viability.
Engine Bottlenecks
Another major concern lies in the Su-57’s propulsion system. The aircraft was initially equipped with the AL-41F1 engine, an upgraded version of the engine used in the Su-35. While this engine provides adequate performance, it falls short of the standards expected from a true fifth-generation fighter. The Su-57 was supposed to be powered by a more advanced engine known as the Izdeliye 30, which promises better thrust-to-weight ratio, improved fuel efficiency, and the ability to supercruise (i.e., sustain supersonic flight without afterburners).
However, the Izdeliye 30 has faced repeated delays and is still not widely deployed. As a result, the current Su-57s are operating with engines that limit their performance envelope and prevent them from fully realizing their design potential.
This engine issue is not just a technical shortcoming, it also affects the aircraft’s competitiveness on the global stage, especially when compared to fighters like the F-22, which has had supercruise capability since its introduction.
Stealth Capabilities
Stealth capability is another area where the Su-57 has drawn criticism. While the aircraft incorporates stealth features such as radar-absorbent materials and internal weapons bays, its overall radar cross-section (RCS) is believed to be larger than that of its Western counterparts. This is partly due to design choices that prioritize aerodynamic performance and maneuverability over stealth.
For example, the Su-57 features a more traditional airframe with exposed engine nozzles and less emphasis on edge alignment and surface smoothness which are key factors in reducing radar visibility. Additionally, the aircraft’s stealth is reportedly optimized for frontal aspects, meaning it is more detectable from the sides and rear. In modern air combat, where beyond-visual-range engagements and sensor fusion dominate, having comprehensive stealth coverage is crucial.
The Su-57’s limitations in this area reduce its survivability and effectiveness in contested environments.
Avionics and Electronics
Avionics and sensor fusion represent another significant weakness. Fifth-generation fighters are not just defined by their stealth or speed, they are also characterized by their ability to gather, process, and share information in real time. This requires highly advanced avionics systems, including radar, infrared sensors, electronic warfare suites, and data links that can integrate seamlessly with other platforms.
While the Su-57 is equipped with a suite of modern sensors, including the N036 Byelka radar system and various electro-optical devices, reports suggest that its sensor fusion capabilities lag behind those of the F-35. The F-35, for instance, is renowned for its ability to create a unified picture of the battlespace and share that data with other units, enhancing situational awareness and coordination. The Su-57’s more limited networking and data integration capabilities place it at a disadvantage in modern, network-centric warfare scenarios where information dominance is key.
Lack of International Interest
Finally, the Su-57 has struggled to gain traction in the international market, raising concerns about its economic viability and long-term support.
Russia had initially hoped to co-develop the aircraft with India under the Fifth Generation Fighter Aircraft (FGFA) program, but India withdrew from the project in 2018, citing concerns over cost, performance, and technology sharing. Since then, Russia has attempted to market the Su-57 to other countries, with only Algeria placing an order on the fighter.
Potential buyers have been hesitant, likely due to the aircraft’s unproven track record, production delays, and geopolitical considerations. Without strong export demand, the cost per unit remains high, and the economies of scale necessary to sustain the program are difficult to achieve. This lack of international interest not only affects the financial sustainability of the Su-57 but also limits its global influence and interoperability.
Su-57 Is No F-35
I would never claim that the Su-57 is not a true fifth-generation fighter, as many have done, since such distinctions are often arbitrarily made.
However, by most objective measurements, the Su-57 is inferior to its Western counterparts in production, performance, and international interest.
The Russians remain confident in the Su-57’s abilities but the fighter has a long way to go before it is ready to take on the F-35.
About the Author:
Isaac Seitz, a Defense Columnist, graduated from Patrick Henry College’s Strategic Intelligence and National Security program. He has also studied Russian at Middlebury Language Schools and has worked as an intelligence Analyst in the private sector.
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