You don’t understand, they are “nazi” because they are nationalists and support their country. So Russian nazis are going to attack Ukrainian nazis do “denazificate” them.
Azov battalion is full-on white nationalist neo nazi and they’re a large and legitimate player in this war. And they’ve been wiped off the map tonight. I guess it depends on your definition of a made up word but I’d certainly call it denazification.
I don't know what the Azov battalion is, but I don't think shelling Kiev has much to do with them.
Edit: They're a far-right/neo-Nazi group in the Donbas, apparently.