From Human Rights Watch:

"New Language Requirement Raises Concerns in Ukraine"

https://www.hrw.org/news/2022/01/19/new-language-requirement-raises-concerns-ukraine

Also: https://www.opendemocracy.net/en/odr/ukraine-language-law-en/

"According to the new law, the only state and official language in Ukraine is Ukrainian. It is to be used during the operation of duties of state power and local self-government. The law does not cover private interaction and religious rituals."