It’s shocking to me how Russia’s primary mode of bombardment isn’t aerial. Are they holding back or they legitimately trying to use dumb bombs to eradicate civi

It’s shocking to me how Russia’s primary mode of bombardment isn’t aerial. Are they holding back or they legitimately trying to use dumb bombs to eradicate civilian cities? There’s no no-fly zone, you can do the same atrocities from air and not risk your troops. What am I missing here?