It is night when the fire brigade in the city of Kharkiv in northeastern Ukraine is called out to the site of the latest Russian missile strike.
A school has been hit. Nobody is hurt but the building is partially destroyed and there is a huge blaze. Among those in the fire engine racing to the burning building is Nils Thal, a professional firefighter from Germany.
Together he and the Ukrainian firefighters try to douse the flames and search the rubble in case anyone is trapped there.