To be frank, you seem to have a cartoon's idea of war.

US is the only country that maybe has a capability to carpet bomb someone to rubble. Russia has always preferred to do it with Artillery anyway, which they have done to many many Ukrainian cities.

A prolonged strategic bombing campaign that can "Wipe a city off a map" takes weeks, hundreds of bombers, and tens of thousands of tons of explosive, and either air supremacy to protect your bombers (not sufficient against a target with SAMs) or the ability to build hundreds of those bombers fresh.

Literally nobody can do that anymore. America can maybe do that once or twice. Only 60ish B52s even remain.