STARE, Ukraine (AP) — More than 100 Ukrainian schoolchildren will have unusual tales to tell their mates when classes resume, after spending part of their summer vacations undergoing training by the National Guard. At night the children were quartered in army tents; by day they got instruction in marksmanship, hand-to-hand fighting, weapons maintenance, first aid, map reading and orienteering. Ukraine's President Petro Poroshenko recently vowed to increase troop numbers to fend off attacks by Russia-backed separatist rebels and warned his countrymen that there is still the threat of a "large-scale invasion."