"Children are hearing explosions, and they are being asked to flee their homes with just the clothes on their backs," Save the Children told Newsweek.
Children living through war will only be safe when parties to conflict take concrete actions to protect them.
Two years of violence in Eastern Ukraine have left "an indelible mark of children," says UNICEF.
A look at why today's U.N appeals have trebled since 2005's $5 billion.
"It makes your belly burn inside of you because of fear."
UN children's agency calls on all parties in conflict to ensure safety of children.