Vadim Shishimarin, 21, was sentenced to life imprisonment on Monday for killing a Ukrainian civilian, in the first war crimes trial held since Russia’s invasion, 

Shishimarin shot an unarmed 62-year-old civilian to death on February 28 in Sumy, according to a report by The Washington Post.

The civilian “died on the spot just a few dozen meters from his own home,” the Ukrainian prosecutor general said in a statement earlier this month. 

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The statement further alleged that Shishimarin stole a car along with other soldiers and drove to Chupakhivka, a village in Sumy. He then spotted an unarmed civilian with a bicycle who was talking on a phone.

The statement added that a Russian soldier then commanded  Shishimarin to shoot the Sumy resident so he would not report the soldiers. Shishimarin then fired multiple shots through a Kalashnikov rifle from the car’s window that hit the unarmed man in the head.

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During the trial, the 21-year-old pleaded guilty and testified that he shot the victim after being ordered to do so.

He also told the court that an officer insisted that the Ukrainian man, who was speaking on his cellphone, could pinpoint their location to the Ukrainian forces.

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Despite Russia’s consistent denial of targetting Ukrainian civilians, several reports of civilian deaths have surfaced since the beginning of the invasion. Allegations of war crimes committed by Russian soldiers also continue to pile up.