Contaminated fuel may have caused Russian Su-57 fighter explosion, reports say
The Telegram channel Ukraine Context claims a Russian Su-57 fighter exploded during engine start-up, possibly because of impurities in jet fuel. The claim rests on unconfirmed reports and is linked to Russia's growing fuel imports after Ukrainian strikes on its refineries.
A Russian Su-57, a fifth-generation multirole fighter, may have exploded during engine start-up because of impurities in its jet fuel. That is according to the Telegram channel Ukraine Context, cited by the Ukrainian outlet Dialog.ua. The explanation is presented as one of the main theories rather than a confirmed fact, and the report gives no official investigation result.
Effect of Ukrainian strikes on fuel production
According to Ukrainian military intelligence, large-scale Ukrainian drone attacks on Russian oil refineries have cut the domestic output of high-quality aviation fuel. Russia is said to have reduced its jet fuel production as a result and to be importing more through opaque supply schemes.
The fuel is reportedly delivered from India by a sea route near Malaysia. In September alone, more than 37,000 tonnes of jet fuel were shipped to Russia this way. Officially, the Russian Federation classified data on deliveries by the company RN-Aero by a decree of Vladimir Putin in summer 2026.
Why fuel quality matters
During transport, transshipment or storage, fuel can become contaminated with impurities that may cause critical engine damage. Although Jet A-1 fuel is theoretically compatible with Russian combat aircraft, buying it through dubious schemes and transferring it on the open sea raises the risk of quality-standard violations. The use of low-quality or substitute fuel is one of the main theories explaining the catastrophic failure of Su-57 engines.
The source says almost all Russian fighters and attack aircraft are now at risk. Media reports also speak of mass crashes among Russian fighters and bombers.
Other incidents
Dialog.UA earlier reported that, according to internal sources, two Russian soldiers were also killed in the attack on Marinovka airfield, in addition to the destruction of two Su-34 fighters.
