OK, I am 10% ignorant on the subject, but...
Why aren't either side using radio frequency jammers to stop the drones?
AGM-88 HARM say's hello Russian jammer
OK, but drone jammers can be suitcase sized or smaller AFAIK? They're just powerful portable radios that flood the frequencies? Wouldn't each squad carry one?
use lots of power
broadcast squad position to everyone
tends to attract attention
jammers are a reactive weapon, something to flip on when the subject realizes they have already been spotted. Problem is subjects typically do not realize they have been spotted in time to flip the jammer on, or the jammer itself is useless to stop the attack even if utilized.
Lastly, worst case, the jammer is a heavy piece of equipment that could be used against the squad even if not activated. Everyone has heard of the radar detector detector the police can use in some jurisdictions. All antennas have a resonant frequency, the frequency they are designed to best transmit or receive on. Sweep a signal across the frequency band, and all antennas in the area will resonate on their designed frequency and generate a weaker return response, which can be detected and located.
I am not sure if the Russian's have the tech to do it. But I know the US does.