A Russian soldier in Ukrainian custody will be the first to stand trial on war-crimes charges, Ukraine’s prosecutor-general said Wednesday, after an investigation alleged he fatally shot at an unarmed 62-year-old man near his home in northeastern Ukraine.

Ukraine’s Prosecutor General Iryna Venediktova said her office filed an indictment on charges of violating the laws and customs of war against the 21-year-old tank-division commander, identified as Vadim Shishimarin. He could face life imprisonment.