Key Points and Summary – Russia’s ambitions for a sixth-generation fighter jet, like the MiG-41 interceptor, are likely destined to fail because it is still struggling to master fifth-generation technology.
-The country’s only operational stealth fighter, the Su-57 “Felon,” has been plagued by production delays, engine development problems, and a lack of export orders.
-Critically, experts and even its own former designers argue the Su-57 doesn’t meet fifth-generation standards, particularly in its stealth characteristics, which are considered vastly inferior to the American F-22 and F-35.
-Russia’s failure to successfully field a true fifth-generation platform casts serious doubt on its ability to develop a viable sixth-generation competitor.
MiG-41 Fighter – Russia’s Fifth-Gen Failures Leave Sixth-Gen Hopes In the Dust
As Russia races to modernize its military hardware, some analysts believe that its sixth-generation fighter programs are destined to fail – and that the writing has been on the wall for years.
While the United States has successfully fielded two fifth-generation fighters – the F-22 Raptor in 2005 and the F-35 Lightning II in 2015 – Russia is still struggling to get its own fifth-gen platform fully off the ground while simultaneously working on sixth-generation projects.
The Mikoyan PAK DP MiG-41, conceived as a high-speed interceptor that would replace the MiG-31, formally entered the R&D phase in 2021. At the same time, the country continues to upgrade its existing Su-57 Felon with next-generation technologies.
On paper, the specs are promising – but many experts believe ongoing development issues and delays mean Russia is struggling to master fifth-generation technology, let alone sixth-generation.
MiG-41 – Russia’s Slow-Moving Sixth-Generation Disaster
Russia’s MiG-41 project is its primary sixth-generation program, with a prototype of the aircraft expected sometime in the mid-2030s. Designed as a high-speed interceptor, the jet is reportedly intended to cruise at Mach 4 or faster and operate at near-space altitudes.
It’s also expected to carry advanced weaponry, including anti-missile lasers, long-range interceptors, and anti-satellite systems. Some reports have suggested that an unmanned version may also be planned.
The Su-57 Fighter Disaster
At the same time, Russia is pursuing sixth-generation upgrades to its existing Su-57 platform – its only operational stealth fighter. The upgrades are crucial for a country still engaged in a prolonged war in Ukraine and now spending roughly one-third of its federal budget on defense.
Originally developed under the PAK-FA program beginning in 1999, the Su-57 was intended to replace the aging Su-27 and MiG-29 jets. First flown in 2010 and introduced in 2020, the aircraft was designed to serve for half a century and has since been gradually upgraded with next-generation systems to ensure that kind of longevity.
But not all has gone according to plan.
Production of the Su-57 remains far below expectations, hindered by engine development delays, international sanctions, and a lack of export orders. The first production model crashed shortly after leaving the factory in 2019, and the Kremlin also rushed the first dozen prototypes directly into service – a move widely seen as desperate, and a sign that Russia was scrambling to prove it could keep pace with the United States.
Russia is also struggling to complete development of the Saturn Izdeliye 30, an afterburning low-bypass turbofan engine designed for new variants of the Su-57. First deployed on a prototype in December 2017, the engine is crucial for delivering true sixth-generation capabilities to the Russian Air Force – especially as work on the MiG-41 faces repeated setbacks.
Progress, however, has been sluggish. Plans to bring the engine into service in the early 2020s have clearly slipped, with no official deployment timeline currently in sight.
Development delays aside, the Su-57’s existing capabilities fall well short of those of its American counterparts. In terms of stealth, the Felon only partially qualifies as a low-observable aircraft. Exposed engine faces, visible seams, and less sophisticated radar-absorbent materials (RAM) mean it simply cannot compete with American systems. The F-22 Raptor, by contrast, features advanced RAM coatings, fully internal weapons bays, and shielded engine intakes. The F-35 goes even further, with diverterless supersonic inlets (DSI), serrated panels, and high-performance RAM materials that contribute to both stealth and aerodynamic efficiency.
That being said, the Su-57 remains Russia’s most advanced option for now – but production is limited, upgrades are slow, and some analysts argue that the aircraft doesn’t even meet the full criteria for a fifth-generation fighter.
Greg Bagwell, a former British Royal Air Force senior commander, told the Kyiv Independent that having seen the plane close-up at Airshow China 2024, he was surprised by the “poor level of engineering workmanship that you would expect on a stealth aircraft.”
Far Below the F-22 and F-35
Writing for National Security Journal in May 2025, national security columnist Steve Balestrieri described the plane as a “failure” and claimed that it is “no match” for the U.S. F-22 Raptor and F-35 Lightning II platforms. Balestrieri noted that the Su-57’s stealth properties “fall far below those of Western stealth aircraft” – a result, he says, of Russia’s limited experience in manufacturing in this field.
Even more damning was a comment made by Vadim Lukashevich, a former aircraft designer at Moscow-based aircraft manufacturer Sukhoi, who himself claimed that the Su-57 doesn’t meet the standards of a fifth-generation aircraft.
“Fifth-generation aircraft have three key indicators. These are supersonic cruising speed, low visibility and the integration of all aircraft systems into a single complex. If we compare American aircraft with ours, then ours is not yet the fifth generation. It does not yet meet the indicator for stealth, it needs to be adjusted. There are also no standard engines that will allow you to match the speed. For the Americans, if we talk about the F-22, then this is a full-fledged fifth-generation aircraft,” he said in 2019.
The MiG-41 May Never Fly
For Russia’s sixth-generation fighter jets to compete with the United States’ next platform, they won’t just need to close the gap, but make a significant leap ahead. And so far, there’s little evidence they can.
The outlook for the MiG-41 is even bleaker. Also writing for this outlet, military expert Reuben Johnson described the project as an “unachievable fantasy for Russia,” noting that it appears to exist only on paper and has already missed its initial 2025 first flight target.
If Russia is still struggling to field a fifth-generation fighter jet that meets even the baseline standards set out by analysts at home and abroad, the viability of its sixth-generation ambition must therefore be seriously questioned.
And if the MiG-41 does eventually materialize, it may arrive too late.
About the Author:
Jack Buckby is a British author, counter-extremism researcher, and journalist based in New York. Reporting on the U.K., Europe, and the U.S., he works to analyze and understand left-wing and right-wing radicalization, and reports on Western governments’ approaches to the pressing issues of today. His books and research papers explore these themes and propose pragmatic solutions to our increasingly polarized society. His latest book is The Truth Teller: RFK Jr. and the Case for a Post-Partisan Presidency.
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