Ukraine isn’t fighting the bulk of their war with drones, so it isn’t really an appropriate comparison. One of the main reasons they’re still in the fight is the plethora of highly advanced munitions that have been provided to them by NATO members. Lastly, drone warfare has become less and less effective over the last year against Russia. There are lots of countermeasures that can be implemented to take out drones. Hell, if you jam radio signals (which is easy to do), they become virtually useless outside of preprogrammed kamikaze tactics.