The campers, some clad in combat fatigues, carefully aim their assault rifles. Their instructor offers advice: Don’t think of your target as a human being.

So when these boys and girls shoot, they will shoot to kill.

Most are in their teens, but some are as young as 8 years old. They are at a summer camp created by one of Ukraine’s radical nationalist groups, hidden in a forest in the west of the country, that was visited by The Associated Press. The camp has two purposes: to train children to defend their country from Russians and their sympathizers — and to spread nationalist ideology.