Do you have a link for this? I hadn't heard about the Russian language being banned. I did know about this from 2019:
https://www.reuters.com/article/us-ukraine-parliament-langua...
"The new legislation requires TV and film distribution firms to ensure 90 percent of their content is in Ukrainian and for the proportion of Ukrainian-language printed media and books to be at least 50 percent."
It also says civil servants must speak Ukrainian. It does not say they can't also speak Russian.
In any case, that's not a ban.