Earlier quoted context omitted.
Moscow could only accomplish this with nukes, and only early in the war. By this point Ukraine has dug underground for most of its crucial war-sustaining industry. Ukraine, well they don't have nukes but as I understand it, much of the USSR's nuclear arsenal was built in Ukraine. I suspect Ukraine could respond tit for tat.
Why can they not use firebombing and other conventional munitions? If they can deliver a nuke surely they can deliver a conventional warhead. That is enough to level an urban area as we see in Gaza.
Russia hasn’t captured Kiev, their artillery can’t reach that far and they don’t have air superiority - Russia hardly has an airforce anymore.