I have a client who has asked me to figure out which countries in a list use "plain" Cyrillic and which use an extended alphabet/encoding. I told the client I need help to do that reliably, so here I am. Below is the list, with what I know or think (the latter marked with a question mark) shown. (Note that some of these countries have a completely non-Cyrillic primary alphabet, but still use some flavor of Cyrillic as a secondary system).
Many thanks for any confirmations/corrections.