As Ukraine welcomes children back to classrooms on the first day of the new school year, certain measures have been taken to ensure their safety. In Kharkiv, the war-torn country's second city, several classrooms have been set up underground inside metro stations. "We have to understand that at this time of war they have to study" explains Igor Terekhov, Kharkiv's mayor, "everything here is made in accordance with the conditions of an actual school." IMAGES AND SOUNDBITES