@isaackuo Ukraine's adapting commercial hardware, like early Great War aircraft using rotary engines originally designed for motorcycles. A state-equivalent actor starting today and setting out to make an invader's costs unbearable isn't going to start there.
There's work going into "looks like a bird", "smallest practical flying robot", and so on. "How small and cheap can something be and have a 5% PK against human targets for a day?" isn't a quadcopter.