As mentioned, the aren't random and it is a side effect of Ukranians putting military installation in the middle of residential areas to the point it was so blatant, Amnesty International called them out earlier in the war for itIMO Russia's war crimes on Ukrainian civilians are countless and unquestionable. Everytime some Russian targets were hit, (i.e. warships, planes, oil refining infra, and etc.), Russia came up with a massive wave of random missile attacks against Ukrainian cities. I'm not saying Ukraine is not doing the same, but Russia is doing more cuz they have much more missiles, adding that Ukrainian military targets are less than Russian ones, therefore Ukraine suffers more crimes against civilians.
We know what actual random mass bombing and deliberate killing of civilians looks like at this point with Gaza.