A Russian Su-57 fighter was destroyed during an engine-start incident at Akhtubinsk military airfield in Russia’s Astrakhan region on October 29, according to an update issued Monday, November 2, by Ukraine’s military intelligence agency.
The agency, known as the HUR, said the fifth-generation aircraft exploded while its engines were being started.
The reported loss has not been independently verified, and Russian authorities have not publicly confirmed the destruction of the aircraft.
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What happened to the Su-57 fighter
According to HUR, the incident occurred at the Russian airfield near Akhtubinsk, a facility associated with testing and operating advanced military aircraft.
The agency described the aircraft as Russia’s newest multirole fighter and estimated its value at about US$150 million.
HUR did not say that an external attack caused the fire.
Instead, its statement focused on a possible connection between the incident and the quality of aviation fuel used by Russian military aircraft.
HUR said engines of the AL-41F1 type can suffer catastrophic damage for several reasons, including the use of fuel that does not meet required standards.
The agency did not provide evidence proving that substandard fuel caused the Akhtubinsk incident.
Fuel supply concerns raised by Ukraine
Ukraine’s intelligence service connected the incident to what it described as Russia’s growing reliance on imported aviation fuel after strikes disrupted some domestic refining capacity.
HUR said a shipment of nearly 40,000 tonnes of Jet A-1 fuel left India’s Vadinar refinery aboard the sanctioned tanker GRIF on August 22, 2026.
The agency said the cargo was later transferred to the tanker HALCYON and delivered to Russia’s port of Nakhodka on September 23.
HUR also said a Rosneft subsidiary supplies aviation fuel to the United Aircraft Corporation under contracts connected to Su-57 production.
Jet A-1 is a widely used aviation fuel standard, and HUR said it can be used in several Russian aircraft types, including the Su-57, Su-34 and Su-35.
Those details describe a possible supply-chain vulnerability, but they do not establish that the fuel involved in the October 29 incident was defective.
Part of a difficult year for Russia’s Su-57 fleet
The Akhtubinsk incident follows several reported setbacks involving Russia’s small Su-57 fleet in 2026.
Ukraine’s armed forces said in May that drones had struck several Su-57 aircraft at Shagol airfield in the Chelyabinsk region on April 25.
The Ukrainian statement said the aircraft were damaged, while noting that the extent of the damage was still being assessed.
A separate Su-57 was reported to have crashed near Moscow in July during a training flight.
Russian officials attributed that crash to a technical malfunction, while Ukrainian-linked sources alleged that the aircraft may have been brought down by friendly fire.
Those claims remain disputed and are separate from the October 29 fire at Akhtubinsk.
Why the loss matters
The Su-57 is intended to serve as Russia’s most advanced operational fighter, combining low-observable design features, advanced avionics and the ability to carry air-to-air and air-to-ground weapons.
Russia has produced the aircraft in relatively small numbers compared with older fighter families such as the Su-30 and Su-34.
That makes the destruction of a single aircraft more significant for testing, training and fleet availability than the loss of a more common Russian combat jet.
The effect on Russia’s wider air campaign cannot be measured from this incident alone.
However, repeated damage or destruction of scarce aircraft could place additional pressure on Russia’s ability to replace losses and maintain specialized training programs.
What happens next
The immediate question is whether Russian officials or later satellite imagery will confirm the extent of the damage at Akhtubinsk.
Further evidence would also be needed to determine whether the aircraft was completely destroyed, damaged beyond economical repair or potentially recoverable.
Until that information becomes available, the most supportable account is that Ukraine’s military intelligence has reported the destruction of a Su-57 during an engine-start fire on October 29, while the cause of the incident remains unproven.
Frequently Asked Questions
When was the Russian Su-57 destroyed?
Ukraine’s military intelligence says the aircraft was destroyed on October 29, 2026, during an incident at Akhtubinsk airfield.
Where did the Su-57 incident happen?
The incident reportedly happened at Akhtubinsk military airfield in Russia’s Astrakhan region.
What caused the Su-57 fire?
The aircraft exploded while its engines were being started. Ukraine’s intelligence agency suggested fuel quality as one possible factor but did not prove that it caused the incident.
Has Russia confirmed the Su-57’s destruction?
No public Russian confirmation was available in the information reviewed for this report.
Is this the first Russian Su-57 loss in 2026?
No. Ukraine has reported earlier Su-57 damage at Shagol airfield, and a separate aircraft was reported to have crashed near Moscow in July.
Fact-Checked: Key dates, locations and claims were checked against Ukraine’s military intelligence and Armed Forces statements, with disputed details identified as unverified.
Disclaimer: This report concerns an active war and relies partly on claims from a combatant’s official agencies that may change as further evidence emerges.