Russia can probably deliver two million tons of conventional high explosives on Ukrainian targets yearly.
That’s 100 times the explosive force of the Hiroshima bomb.
Come winter any Ukrainian movement will show up in the snow, making targeting much more accurate.
Decoys.
Russia now has serious problems with logistics support of its artillery. Their rate of fire is way down, as it appears in the truly amazing satellite fire maps.
It doesn’t seem like Russia can plan on its “2 million” tons of explosives. They have no answer, as yet, to Ukrainian means of counterbattery and interdiction, and in that Ukrainian capabilities can only improve.