The UN-backed tribunal was ruling on an appeal by Khieu Samphan, head of state for the regime that wiped out a quarter of the Cambodian population in less than four years in the 1970s.
A three-member International Crimes Tribunal convicted the defendants on charges of committing murders and engaging in looting, kidnapping and arson in the southwestern city of Khulna.
The number is equal to about 83 civilians suffering violent deaths due to conflict every day for the past 10 years, according to a latest UN report.
The 21-year-old sergeant, Vadim Shishimarin, pleaded guilty to the killing of a 62-year-old civilian in northeast Ukraine in the first days of the Kremlin's offensive.
Ali Muhammad Ali Abd-Al-Rahman faces 31 counts of war crimes and crimes against humanity for his role in a conflict almost 20 years ago.
The United Nations drew up a list of 142 individuals who warrant investigation for crimes including mass rapes and sexual slavery of women and deliberate killing of scores of children.
US President Joe Biden called Russian President Vladimir Putin a "war criminal" over his actions in Ukraine but the White House later clarified that there is a process for such a formal determination.
As an international institution of justice, the court is failing millions of Syrians and victims of war crimes and atrocities.
The Ethiopian Human Rights Commission has catalogued a litany of abuses, including torture, gang rape and enforced disappearances, saying some may amount to war crimes.
The US military never conducted an independent investigation into a 2019 bombing on the last bastion of the Daesh terror group, despite concerns about a secretive commando force which may have committed war crimes.
Instead of focusing on the future of Daesh, let’s remember the Yazidis they enslaved in the past
Kiev filed the case shortly after hostilities began on February 24, accusing Russia of illegally justifying its war by falsely alleging genocide in Ukraine's Donetsk and Luhansk regions.
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