Ukraine

Not to discredit their work, but it's basically a rugged drone with an antipersonnel munition strapped to its belly, most likely already made with Chinese PCBs and motors.

The drone part is something that already existed and I'm sure the Chinese have some kind of antipersonnel airburst munition already as well.

Pandora's Box on drone warfare was opened a long time before the current invasion, although we haven't yet seen the bottom of it.