A Russian soldier went on trial in Ukraine Friday for the killing of an unarmed civilian, marking the first war crimes case since Russian President Vladimir Putin’s invasion.

Sgt. Vadim Shyshimarin, 21, a member of a Russian tank unit, is accused of shooting a 62-year-old Ukrainian man in the head through an open car window in the northeastern village of Chupakhivka during the first week of the war.

After the soldier’s capture, the Security Service of Ukraine, known as the SBU, posted a short video on May 4 of Shyshimarin describing on camera how he shot the man. The SBU described the video as “one of the first confessions of the enemy invaders.”

“I was ordered to shoot,” said Shyshimarin, wearing a blue and gray hooded sweatshirt. “I shot one (round) at him. He falls. And we kept on going.”