After being wounded in the leg by an attack drone on the front lines of eastern Ukraine, Surovyi, a 40-year-old Ukrainian soldier, knew his flight to safety would be fraught with danger.

In the end, it meant five days of crawling through the scrub, hiding in ditches and covering himself with branches and earth to escape the gaze of Russian surveillance and attack drones buzzing in the air searching for targets.

"My leg went numb, I do not even know how to call this feeling, but I understood it was useless and I said to my comrade: let's get out of here or we will get killed," he recalled in an interview.