Eli Zaretskii <eliz@gnu.org> wrote:
>> From: Viktor Larkin <com.larkin@gmail.com>
>>
>> I've found this topic https://www.reddit.com/r/emacs/comments/bvuv9q/cyrillic_letters_dont_work_with_find_in_emacs/eptkhsr/
>
> This is a duplicate of bug#36085

Neither Reddit thread nor that bug mention the most obvious workaround though: