Here are the important rules when it comes to Native scripts (when to use alphabets other than latin) and capitalization.
For the following languages, the native script has to be used for all metadata (Album titles, track titles, versions etc.):
Russian (Cyrillic script)
We do not deliver releases in Chinese script to iTunes and Apple Music due to the very strict and specific guidelines for Chinese releases.
No transliterations (translations in the title) are accepted. A track cannot, for example, be called Je t'aime (I love you). But you can call it “Je t’aime’ or “I love you”. Languages and Capitalization
Remember that different languages have different rules capitalization rules in the stores. We may not approve the release or manually change capitalization if these guidelines are not followed in order to get your release live in all stores.
If you decide to exclude iTunes and Apple Music when releasing your music, you don't need to follow these rules.