Western media had previously reported a fighter jet had crashed, citing anonymous sources FILE PHOTO. © Matthew Horwood/Getty Images Ukraine's General Staff has confirmed that a Western-supplied F-16 fighter jet has been lost along with its pilot. A handful of F-16s were delivered to Ukraine earlier this month. Ukrainian leader Vladimir Zelensky, meanwhile, confirmed on Tuesday that the jets had seen action during a massive Russian missile attack the day before. “Contact was lost with one of the planes as it followed a target. As it turned out, the plane crashed and the pilot died,” the General Staff said in a statement on Thursday evening. The Defense Ministry in Kiev has established a special commission to investigate the incident. A source within the Ukrainian Air Force told Voice of America that among the options currently under consideration are pilot error, technical malfunction and “friendly fire” from Ukrainian air defenses. Earlier in the day, the Wall Street Journal and CNN reported that one of the Ukrainian F-16s was “destroyed in a crash on Monday,” one citing a US official and the other a source in Kiev. There were conflicting reports on whether pilot error was to blame. The fallen pilot was identified as Aleksey Mes, callsign ‘Moonfish', one of just a handful of Ukrainian pilots trained in the West to fly F-16s. His death was first revealed by the obituary posted on social media by a councilman in Lutsk, where Mes was from. Mes and one of his squadron mates, Andrey ‘Juice' Pilshchikov, were the faces of Ukraine's campaign to get the F-16s, giving multiple interviews to Western media. Pilshchikov was killed in action last August. DETAILS TO FOLLOW