In July this year a 17-year-old travelled 500 miles from his home in eastern Ukraine to collect a bomb and a phone hidden in a park in the western city of Rivne.
He says he was promised $2,000 (£1,520) to plant the bomb in a van used by Ukraine's military conscription service.
"When I was connecting the wires, I thought it could explode then. I thought I might die," he told the BBC.
Vlad is one of hundreds of children and older teenagers who the Ukrainian government alleges have been recruited online by Russia, and offered payment to carry out sabotage and other attacks against their own country. His name has been changed to protect his anonymity.
He says he was told to set up the phone to live-stream the scene to his handler so they could remotely detonate the device when somebody entered the vehicle.
