A Russian IL-76 transport aircraft leads SU-30 and SU-35 fighter jets attached to the Russian Aerospace Forces fly over the sky in formation during a flight training exercise at a military airfield in northeast China. They are in preparation for the Aviadarts event of the International Army Games (IAG) 2017 to be held in China from July 30 to August 12, 2017. (Photo/81.cn)
