Unidentified people beat Svyatoslav Sheremet (L, bottom), head of Gay-Forum of Ukraine public organization, in Kiev, May 20, 2012. Sheremet was attacked after meeting with members of the media to inform them that a scheduled gay parade was cancelled. The attackers ran off when they realised members of the media were documenting the attack. (Photo by Anatolii Stepanov/Reuters)
Kazakh troops march during a parade of the armed forces to mark the Defender of the Fatherland Day in Astana, May 7, 2014. (Photo by Mukhtar Kholdorbekov/Reuters)
Participants wearing masks during a hazy day at the Beijing International Marathon in front of Tiananmen Square, in Beijing, October 19, 2014. (Photo by Reuters/Stringer)
A masked reveller hangs from an inflatable balloon during the first day of the carnival in Venice, Italy, January 23, 2016. (Photo by Manuel Silvestri/Reuters)