Russians keep sending the Iranian Shahed drones but Ukraine seems to shoot them down quite easily. They struggle more with the more advanced weaponry.
There's of course cost/benefit, the drone may well be cheaper than the fancy rocket that shot it down.
But then there's a deluge of new anti drone weaponry so it's hard to know what that balance will look like in even 5 years time.
In Drone warfare, smaller definitely wins. I suspect we'll start seeing anti-drone drones soon enough.
Smaller drones are a perfect use case for older systems like the Zhilka -- no need for a rocket.
EW and HARMs are also a big discussion topic there.
It's kind of logical to see expensive AA systems designed to shoot down expensive planes struggling to answer swarm of cheap drones cost effectively.
But the good performance of very old systems like Gepard indicates solutions exist. For example, systems with a decent and modern radar plus a few short range low caliber and cheap AA guns will probably get designed and fielded in the near future.
And new weapon systems is not the only answer. Jamming also has proven to be effective. And even simple doctrine changes can be effective.
Drones are enjoying an happy time, but it will end and to a degree already has (tb2 is far less prevalent for example).
However they are indeed a huge asset on the battle field, and they do mean that we need to rethink everything about how war is conducted.
Disclaimer: I am 100% on the side of Ukraine and will remain so no matter what happens with the war, upto and including a complete genocide of Russia.