WATCH: Killer robots set to change Ukraine war, but expert remains skeptical of long-term success

The ground-based drones pose a great opportunity for new tactics, and can serve a great range of purposes, including the retrieval and transport of injured soldiers from the battlefield.

Peter Aitken is a Fox News Digital reporter with a focus on national and global news. 

"To supervise the engagement of targets is a massive difficulty – up in the sky or underwater, open space is easy to maneuver, but you don’t have the tight control and spaces you get on the ground. It’s a mess."

"Collecting casualties? Yes. Breaching a door … yes, they already have that technology, and it does well, and those are usually semi-autonomous or remotely controlled, but it’s a hard problem to solve: The cost per unit is high, [and] it’s the hardest, most difficult challenge from a technology perspective all the way from a manufacturing to planning perspective."