Front-line volunteer saves lives in war-torn Avdiivka.

Kuba Stasiak, a 28-year-old volunteer from Poland, has helped evacuate an estimated 200 Ukrainian civilians from besieged cities in Ukraine's Donbas region. Volunteers like him face psychological hurdles as well as practical ones: How do you convince someone it is time to leave everything behind? Stasiak is usually familiar with the people he saves by the time he gets around to evacuating them. Building trust is a central component of the work. "What helps is to be around, so people know our faces and become more trusting. Even if they aren't ready to leave right away, some of them change their minds and, when they do, they know how to find us," he said.