Oliver Schulz is the first former or serving Australian Defense Force member to face a war crime charge of murder under domestic law for his alleged role in the shooting of an unarmed Afghan man.
The Russia-Ukraine war is now in its 395th day.
The arrest is part of ongoing investigations into alleged war crimes committed by Australian troops in Afghanistan between 2005 and 2016.
Kiev hails decision as "historic" but Moscow dismisses order, saying it has "no meaning" for Russia.
A report published by Syrian Network for Human Rights on the 12th anniversary of the outbreak of pro-democracy protests in Syria documents the fatalities caused by the ensuing war since 2011.
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.
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