These Ukrainian students attend an underground school to protect them from Russian strikes

Life for children across Ukraine has changed significantly since Russia's full-scale invasion, almost two years ago. When air raid sirens go off, students are forced to run to bomb shelters. In Kharkiv, Ukraine's second-largest city, air raid sirens are more frequent because of the city's proximity to the Russian border. The World's Daniel Ofman reports from a local underground school in Kharkiv.