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)

A Russian peacekeeper shouts “No pictures!” at a checkpoint outside the city of Stepanakert on November 13, 2020, during a ceasefire in the military conflict between Armenia and Azerbaijan over the breakaway region of Nagorno-Karabakh. Russian began deploying 2,000 peacekeepers to Nagorno-Karabakh on November 10 after Armenia and Azerbaijan agreed a peace deal to end weeks of fierce fighting over the disputed region. (Photo by Alexander Nemenov/AFP Photo)

Nuns react at the arrival of Pope Francis at the St. Mary's school to attend a meeting of clergy and religious in Nairobi, Kenya, 26 November 2015. Pope Francis is on a six days visit that will take him to Kenya, Uganda and the Repulic of Central Africa from 25 to 30 November. (Photo by Daniel Dal Zennaro/EPA)

Isabella Ferrari and Ben Ra pose for a photograph taken by Jacob deBlecourt at the City of Boston's Pride Kickoff event, celebrating the start of National LGBTQ+ Pride Month, in Boston, Massachusetts, U.S., June 1, 2022. (Photo by Brian Snyder/Reuters)

A father and son spend all day fishing in Naogaon, northern Bangladesh in the first decade of December 2024, before heading to market to sell their 3kg catch for the equivalent of a few pounds. The vibrant green algae makes conditions difficult but that does not deter them. (Photo by Estiak Ahmed Munna/Solent News)

A young woman shows off her henna tattoos at the end of Eid al-Fitr prayers in Bucharest, Romania, Wednesday, April 10, 2024. Members of the Romanian Muslim community joined prayers at the Dinamo stadium in the Romanian capital, in the largest Muslim public gathering of the year. Eid al-Fitr marks the end of the holy fasting month of Ramadan. (Photo by Andreea Alexandru/AP Photo)

People enjoy their time near the Arcadia stage at the Glastonbury Festival site in Somerset, Britain on June 24, 2023. (Photo by Jason Cairnduff/Reuters)

Libya's leader Muammar Gaddafi attends a meeting with Italian President Giorgio Napolitano at the Quirinale Palace on June 10, 2009 in Rome, Italy. Colonel Gaddafi is in Rome to attend a meeting of G8 Development Ministers. (Photo by Franco Origlia/Getty Images). ROME – JUNE 10