A Mi-28N (top) from the Berkuty (Golden Eagles) helicopter display team flies in formation during a performance before its hard touchdown at the “Aviadarts” military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. The aircraft started dipping down due to back propeller failure and crashed, killing one of two pilots, according to a Reuters photographer and official representatives of the competition. The aviation contest is part of the International Army Games, which are held in Russia from the 1st till the 15th of August with participants from 17 countries, according to organizers. (Photo by Maxim Shemetov/Reuters)

A MIG-29 fighter performs during the “Aviadarts” military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. (Photo by Maxim Shemetov/Reuters)

Russian Mi-28N from the Berkuty (Golden Eagles) helicopter display team fly in formation during the “Aviadarts” military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. (Photo by Maxim Shemetov/Reuters)

Russian Sukhoi Su-25 Frogfoot ground-attack planes perform during the Aviadarts military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. (Photo by Maxim Shemetov/Reuters)

Russian Mi-28Ns from the Berkuty (Golden Eagles) helicopter display team fly in formation during the Aviadarts military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. (Photo by Maxim Shemetov/Reuters)

A Sukhoi SU-35 fighter aircraft performs during the “Aviadarts” military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. (Photo by Maxim Shemetov/Reuters)

A Tu-22M3 bomber performs during the “Aviadarts” military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. (Photo by Maxim Shemetov/Reuters)

Su-34 fighter-bombers (top) perform during the “Aviadarts” military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. (Photo by Maxim Shemetov/Reuters)

Smoke rises from the ground during the “Aviadarts” military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. (Photo by Maxim Shemetov/Reuters)

A Russian Mi-28N helicopter and Sukhoi Su-25 Frogfoot ground-attack planes (top) perform during the “Aviadarts” military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. (Photo by Maxim Shemetov/Reuters)

A Russian Mi-28N helicopter flies during the “Aviadarts” military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. (Photo by Maxim Shemetov/Reuters)

A Mi-28N from the Berkuty (Golden Eagles) helicopter display team descends before a hard touchdown during the “Aviadarts” military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. The aircraft started dipping down due to back propeller failure and crashed, killing one of two pilots, according to a Reuters photographer and official representatives of the competition. (Photo by Maxim Shemetov/Reuters)

A Mi-28N from the Berkuty (Golden Eagles) helicopter display team touches the ground during a hard touchdown during the “Aviadarts” military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. (Photo by Maxim Shemetov/Reuters)

A Mi-28N from the Berkuty (Golden Eagles) helicopter display team touches the ground during a hard touchdown during the “Aviadarts” military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. (Photo by Maxim Shemetov/Reuters)

Mi-28N from the Berkuty (Golden Eagles) helicopter display team is seen on fire after a hard touchdown during the “Aviadarts” military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. (Photo by Maxim Shemetov/Reuters)

A pilot stands near a burning Mi-28N from the Berkuty (Golden Eagles) helicopter display team after a hard touchdown during the “Aviadarts” military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. (Photo by Maxim Shemetov/Reuters)

A pilot stands near a burning Mi-28N from the Berkuty (Golden Eagles) helicopter display team after a hard touchdown during the “Aviadarts” military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. (Photo by Maxim Shemetov/Reuters)

Firefighters work to extinguish fire, which overtook a Mi-28N from the Berkuty (Golden Eagles) helicopter display team after a hard touchdown during the “Aviadarts” military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. (Photo by Maxim Shemetov/Reuters)

A pilot of a Mi-28N helicopter from the Berkuty (Golden Eagles) display team lies on a stretcher while being loaded into a helicopter on the way to a hospital after an accident at the “Aviadarts” military aviation competition at the Dubrovichi range near Ryazan, Russia, August 2, 2015. (Photo by Maxim Shemetov/Reuters)