The number of students in her school has increased since Russia invaded Ukraine as children evacuated from the eastern and southern parts of the country near the front lines of the prolonged war, now well into its second year. Next month, her school expects to have about 3,500 students -- well above its capacity to shelter them from attacks. "Our school has two shelters, where up to 1,000 children can hide. Every day 2,000 children attend the school in two shifts," said the 68-year-old principal. "We cannot have more children in the school at one time than the shelters' capacity. The rest of the children study remotely. For example, students in grades 5 to 9 study one week offline at school and the next week remotely."