Human Rights Watch said in a report that the response to Ukraine "exposed the double standards" of most EU countries "in their ongoing treatment of countless Syrians, Afghans, Palestinians, Somalis and others seeking asylum."
A representative from each side of the conflict, as well as delegates from the African Union and an East African bloc, will form a joint committee to safeguard the peace deal signed in November.
London's announcement follows a BBC report earlier this year that claimed British troops killed 54 unarmed Afghan men "in cold blood" and weapons were planted on them to justify the crimes.
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.
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