Serbian police officers of the Special Anti-Terrorist Unit pose for a picture in their base outside Belgrade October 8, 2014. When the killing of an unarmed black teenager by a white policeman in Ferguson, Missouri, in August sparked sometimes violent protests, the response of police in camouflage gear and armoured vehicles wielding stun grenades and assault rifles seemed more like a combat operation than a public order measure. Some U.S. police departments have recently acquired U.S. military-surplus hardware from wars abroad, but there are many law enforcers around the world whose rules of engagement also allow the use of lethal force with relatively few restrictions. But for every regulation that gives police wide scope to use firearms, there is another code that sharply limits their use. In Serbia, police may use measures ranging from batons to special vehicles, water cannon and tear gas on groups of people who have gathered illegally and are behaving in a way that is violent or could cause violence, but they may use firearms only when life is endangered. (Photo by Marko Djurica/Reuters)

Deputies in the Ukrainian parliament brawled in the chamber on Tuesday, April 8, 2014 after a communist leader accused nationalists of playing into the hands of Russia by adopting extreme tactics early in the Ukrainian crisis. Two deputies from the Svoboda far-right nationalist party took exception to the charges by communist Petro Symonenko and seized him while he was talking from the rostrum. (Photo by Valentyn Ogirenko/Reuters)

A photograph of a girl carrying a baby on the spot of the previous day's car bomb attack that killed killed and wounded hundreds at the Sadriyah market in Baghdad, Iraq, Thursday, April 19, 2007, is inserted into the scene at the same location on Monday, March 20, 2023, 20 years after the U.S. led invasion on Iraq and subsequent war. (Photo by Hadi Mizban/AP Photo)

Myanmar's Theiri Aung, seen in action during the women's sepak takraw semifinal against Vietnam, at the Southeast Asian Games in Hanoi, on May 17, 2022. (Photo by Athit Perawongmetha/Reuters)

A vendor sells Guy Fawkes masks and items with the colors of the national flag at a market ahead of Independence Day celebrations in Karachi, Pakistan, 13 August 2023. Pakistan celebrates its 76th independence anniversary from British rule in 1947 on 14 August 2023. (Photo by Shahzaib Akber/EPA/EFE)

Revellers make the most of Friday night in Soho, central London after the hottest day of the year recorded in the capital this year, June 17, 2022. (Photo by Marcin Nowak/Alamy Live News)

A lynx cub that followed a villager in the forest, is fed by a mother and her son for 2 days at the Koyulhisar district of Sivas, Turkiye on October 4, 2023. After 2 days, the lynx cub was taken under protection by the Sivas Department of Nature Conservation and National Parks teams. (Photo by Serhat Zafer/Anadolu Agency via Getty Images)

Katelin Wie Qi Heng of Team Singapore competes with ball during the Team Final and Individual Qualification on day seven of the Birmingham 2022 Commonwealth Games at Arena Birmingham on August 04, 2022 in Birmingham, England. (Photo by Elsa/Getty Images)