I can imagine some kind of light grating (like a cope cage) preventing a net from getting into the propellers.

Personally, I think consumer-grade drones are around their maximum lethality in warfare now, and that countermeasures will gradually catch up before an equilibrium is reached. Much like heavy water-cooled machine guns were at their maximum lethality sometime during WWI, before stuff like armour, mobility, snipers, and accurate medium-range strikes (artillery and CAS) started countering them.

Especially now that a lot of military powers not actively involved in the war (US, a bunch of European militaries, China, India, …) see a very clear incentive to invest heavily in developing anti-drone capabilities. Before long, I think we’ll see highly effective “interceptor drones”, possibly even autonomous ones, that can track a given infantry unit and provide air cover (basically the development that happened for aircraft). I also think we’ll start seeing more and better purpose-built anti-drone weapons that ordinary infantry can carry (like MANPADS).

A drone with wire cutter propeller blades to shred nets and fibre wires.

The moment I read your comment, I started thinking of how I would approach disarming that thing.

The answer is that it’s still dangerous. Effectively it’s now an IED that the enemy is watching, and is still under the enemy’s control.

The camera can still see, and you have to assume it also has remote detonation control.

To disarm it by cutting the fiber optic line, you’d have to go around it, in a manner that the immobilized drone, and any other monitoring enemy drones couldn’t see you.

Better just detonate it with a dropped munition, or monitor it and wait for the Russians to risk their own butts trying to retrieve it.

Cut the fiber optic cable then retrieve it to learn more about Russian capabilities.