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. 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)

Revellers parade for Gavioes da Fiel samba school during carnival in Sao Paulo, Brazil, February 6, 2016. (Photo by Paulo Whitaker/Reuters)

A participant takes part in the annual Jack In The Green parade involving hundreds of costumed revellers joining a four hour procession culminating in the traditional “slaying” of a Jack character to “unleash the spirit of summer” on the May Day week end, in Hastings, southern Britain, May 2, 2016. (Photo by Toby Melville/Reuters)

Women hold hands during the Tokyo Rainbow Pride parade celebrating lesbian, gay, bisexual, and transgender (LGBT) culture in Tokyo, Japan, May 8, 2016. (Photo by Thomas Peter/Reuters)

Indian police women take part in a full dress rehearsal for the Republic Day parade in Srinagar January 24, 2015. India will celebrate its annual Republic Day on Monday. (Photo by Danish Ismail/Reuters)

A man dressed up as a "Catrin", a Mexican character also known as "The Elegant Death", is pictured during a Catrinas parade in Mexico City October 31, 2015. (Photo by Carlos Jasso/Reuters)

An Aymara woman with a sheep waves to the crowd during a Christmas parade in La Paz, Bolivia December 12, 2015. (Photo by David Mercado/Reuters)

Gurung girls wearing traditional costumes dance while taking part in a New Year parade in Kathmandu, Nepal December 30, 2015. Members of the Gurung community in Nepal celebrate their Tamu Lhosar or Losar (New Year) with a feast and various cultural programs to usher in the year of the Monkey. (Photo by Navesh Chitrakar/Reuters)