A RUSSIAN fighter jet crashed during a training session today after a mysterious explosion, killing both crew members onboard. The two seater Su-30 fighter jet – an aircraft used often by Russian forces in Ukraine – crashed in Kaliningrad. The Su-30 fighter jets have been used in UkraineGetty GettyThe jet was being used in a training exercise[/caption] Telegram channel 112 reported that as the jet was descending, an explosion sounded in the air and the Su-30 then crashed. The Western Military District said in a statement: “On August 12, while performing a training flight in the Kaliningrad region, a Su-30 aircraft crashed in a deserted area. “The flight was carried out without ammunition. The crew died.” According to preliminary data, the cause of the emergency was a technical malfunction. In October, a Su-30 jet plunged nose-first into a suburb of Irkutsk while on a test flight from the Irkutsk Aviation Plant. The pilots are understood to have suffocated in the plane’s cockpit – leading to the jet falling from the sky like a stone. Videos from onlookers and dashcams caught the moment of the crash and explosion into a residential house in Siberia. Both airmen died in the fireball. Three children were said to have been evacuated from the two-storey building hit by the out-of-control plane.