The only reasonable counter-tactic against cheap drones have been EW measures. They're by no means perfect but it's the best any of the two sides has at this moment (yes, it's better than the AA weaponry they have at their disposal).

Here's a video [1] of a Ukrainian drone hitting Russian EW equipment on a tower and here's a Russian video [2] presenting their EW works against incoming Ukrainian drones.

[1] https://old.reddit.com/r/UkraineRussiaReport/comments/17fbxo...

[2] https://old.reddit.com/r/UkraineRussiaReport/comments/17gnna...