Ukrainian soldiers sprint away from a disabled tank on the battlefield while their control room desperately tries to help them evade the Russian drones pursuing them.  

Later, a Russian soldier waves a white flag from the basement entrance of a gatehouse which was targeted by Ukrainian quad-copter drones.

It's become a war of the future in the so-called "kill zone" in the Donbas region of Ukraine - where the trench lines are gone and drones rule the skies.  

Tom Cheshire speaks to Sky's international correspondent John Sparks - who spent 24 hours watching the life-or-death drama from a high-tech control hub where a Ukrainian unit runs their operations.

Producer: Tom Gillespie
Editor: Wendy Parker