Drone avoidance training
The drone manufacturers need to be charged the cost of testing some of the drones and how they impact planes and helicopters. Aircraft manufacturers pay to test bird strikes.
Guidelines need to be created and tested. These guidelines then need to be a part of pilot training (on paper or with a simulator?).
I would assume the best practice would be for the helicopter to increase altitude. Maybe these drones need an automatic drop from the sky when plane/helicopter is detected within ##m. Or for drones to obey a generic "drop from the sky" signal that is sent from the aircraft.
Biting the hand that feeds IT
