At a children’s hospital in Lviv, an 8-year-old girl from eastern Ukraine named Mariia drew an orange-striped cat sitting atop a kitchen table, Yustyna Pavliuk recalled.

Twenty-three-year-old Mira Kapitan, a cheery copywriter and hip-hop artist originally from a suburb of Kyiv, ... Ivanka Kutsenko, 29, a volunteer for the non-profit Lviv Vegan Kitchen, ...