A Russian Su-57 fifth-generation fighter crashed on 23 July during a training flight in the Odintsovo district west of Moscow. The pilot ejected and survived; no casualties or ground damage were reported. The Russian Investigative Committee has opened a criminal case into possible violations of flight safety regulations, while the defence ministry stated the aircraft was unarmed and fell in an uninhabited area.

The Russian defence ministry, in a statement to state news agency TASS, described the aircraft only as a “training-combat aircraft” and did not confirm the model. Multiple Russian media outlets, including Kommersant and the Telegram channel Mash, cited anonymous sources identifying the plane as a Su-57, Russia’s most advanced operational stealth fighter. The ministry’s wording, according to the independent outlet The Bell, matches the description of a two-seat Su-57 variant whose flight tests were announced in May, raising the possibility that the lost aircraft was a prototype rather than a serial single-seat model. The ministry attributed the crash to a technical malfunction.

The loss of any Su-57 airframe carries significant financial and operational weight. Under a 2019 contract, the Russian aerospace forces are to receive 76 of the jets by 2028, at an estimated unit cost of 2.2 billion roubles ($28 million). Deliveries have been slow: the first serial aircraft entered service only in December 2020. Western military analysts note that the fleet remains small, and each airframe is a critical asset for a force that has reportedly deployed Su-57s in the war against Ukraine, according to British defence intelligence. The crash, if it involves a serial single-seat fighter, would mark the first operational loss of the type, though a previous Su-57 crashed in December 2019 during a pre-delivery test flight in the Khabarovsk region due to a control system failure.

The Su-57 programme has been central to the Kremlin’s narrative of military modernisation, with President Vladimir Putin personally overseeing the 76-aircraft order. The jet was tested in combat conditions in Syria, according to former defence minister Sergei Shoigu. The current investigation will be conducted by a military commission alongside the Investigative Committee. No timeline has been announced, but the findings will be closely watched by defence ministries in NATO countries, where the Su-57 is assessed as a capable but still maturing platform. The Russian defence ministry has not indicated whether the crash will affect the delivery schedule.