March 21: The US has urged Chinese President Xi Jinping to press Vladimir Putin on ceasing the "war crimes" being carried out by Russia in Ukraine.
The two will meet again on Tuesday for official talks during Xi's first visit to Moscow since the invasion.
MAY 13: Vadim Shishimarin appeared at a preliminary hearing in Kyiv. He faces life in prison if convicted.
Ukraine says it has identified thousands of potential war crimes committed by Russia.
Russia has denied targeting civilians and made no comment on the trial.
Prosecutors say Mr Shishimarin was driving in a stolen vehicle with other soldiers in the north-eastern Sumy region when they encountered a 62-year-old cyclist using a phone.
He was ordered to shoot the civilian to stop them from telling Ukrainian defenders about their location, according to the prosecutors.
It is not clear how he was captured or what the nature of the evidence against him is.
Mr Shishimarin spoke to confirm basic details such as his name. He is yet to enter a plea, and the trial will reconvene next week.
Hundreds of bodies have been found in regions previously occupied by Russia.
Some of Ukraine's allies, such as the UK and US, have joined the country in accusing Russia of carrying out genocide.
After the hearing, state prosecutor Andriy Synyuk told Reuters: "This is the first case today. But soon there will be a lot of these cases."
Moscow faced global revulsion and accusations of war crimes Monday after the Russian pullout from the outskirts of Kyiv revealed streets, buildings and yards are strewn with corpses of what appeared to be civilians.
European Union judicial coordination agency Eurojust says it has helped Poland, Lithuania and Ukraine to establish a joint investigation team to probe war crimes, crimes against humanity and other crimes committed in Ukraine.
UK Deputy PM Dominic Raab will visit the International Criminal Court (ICC) in The Hague on Monday to offer "practical support" from the UK for investigating alleged war crimes in Ukraine.
As more than 2 million refugees from Ukraine begin to scatter throughout Europe and beyond, some are carrying valuable witness evidence to build a case for potential war crimes.