Russia still does not have air superiority, so they actually might be afraid to commit bombers here as there is still working Ukrainian air defence. And Russia

Russia still does not have air superiority, so they actually might be afraid to commit bombers here as there is still working Ukrainian air defence. And Russia is very obviously shelling entire cities indiscriminately, there is no possible way to claim this has a direct military purpose. Bombarding an entire city with artillery is a war crime.