Besides MiG-25 aircraft, the Ukrainians also refurbished both Mirage F-1ED fighter jets of the pro-GNA air forces (serial numbers 502 and 508—the same two that defected to Malta on 21 February 2011), and with their help the pro-GNA forces brought them back into operational status by early 2015, using them extensively to bomb both ISIL militants and pro-LNA forces throughout 2016—but on 3 June 2016, one of the two pro-GNA Mirage F1ED fighter jets crashed west of the city of Sirte due to technical problems, its pilot ejected safely (according to other sources, ISIL militants shot it down, its pilot, a Portuguese mercenary, was killed). The last remaining pro-GNA Mirage F1ED fighter jet was not airworthy as of 2017 and was put in storage by the pro-GNA forces, as it lacked a functional engine due to lack of spare parts.