Herson Lyudmils was in training to be a Ukrainian border control officer. When she last spoke to him, Lyudmils told Shelton he was going to the frontlines of the war against Russia.
Ukraine's Interior Ministry says 352 civilians have been killed, including 14 children. It says an additional 1,684 people, including 116 children, have been wounded. The ministry's statement does not give any information on casualties among Ukraine's armed forces.
"I know he will do what is right and follow his heart," Shelton said.
Meanwhile, the BBC reports that Ukraine President Volodymyr Zelenskyy told British Prime Minister Boris Johnson in a phone call this evening (UK time) that the next 24 hours will be crucial for Ukraine.