If they’re up to 20 km it could take you a while and they’re very small and difficult to see, possibly going through difficult terrain.

Maybe they’re not able to use stairs

Drones are controlled by varying the speed of the motors while helicopters are controlled by varying the pitch of the blades at various points in the rotation. If a motor fails on a drone then it’s lost, there is no way of controlling it. The helicopter rotor will spin while falling and the pilot can then mechanically control the pitch of the blades purely mechanically which gives some control.

The change of pitch in the helicopter rotor throughout the rotation can be seen here https://www.youtube.com/watch?v=0shLv2_Rtnc

Psych reference?

You mean Magic Head?

You don’t have to post it. It’s not exactly big news

I suppose it’s a start at least

By allowing Russia to expand it further provokes the west to use nuclear weapons. Huh, guess we’re at a deadlock. I guess Russia could give back what they stole.