This is badly incorrect. You have fantastical ideas about how artillery works. Perhaps you've seen images of a few cratered wheat fields and figure that is Russian SOP and goes on 24x7. It doesn't. Those are major operations that require a lot of costly preparation and time. Russia can't afford to do it on a whim, firing whilly nilly at phantoms. No one can.

Fire must be directed. Otherwise you're just making noise.