The BBC's Jonathan Beale reported from inside Slovyansk, one of four cities that make up Ukraine's "fortress belt" - a system of heavily reinforced defence lines in the parts of eastern region of Donetsk still under its control.
The town has become almost uninhabitable and has been under heavy bombardment from Russian drones, missiles and glide bombs.
Members of a Ukrainian drone unit that call themselves Peaky Blinders, named after the cult BBC TV series, have taken on the task of intercepting Russian drones.
Russia wants Kyiv to give up the fortress cities and they are central to talks on a possible peace deal that have resumed after nine months between Ukraine, Russia and the US in Abu Dhabi.