Hello. Can anyone identify this Cyrillic font? I had no success with WhatTheFont, not even a close match.

this one's quite similar.
It seems є has been modified.
https://www.vectorstock.com/royalty-free-vector/the-alphabet-old-russian-font-inscription-vector-26873213

Thank you. Yes, it is a good match. I thought for a moment it is not a font, but a custom typeface.