MySQL 8.4 Reference Manual Including MySQL NDB Cluster 8.4
The Cyrillic character sets and collations are for use with Belarusian, Bulgarian, Russian, Ukrainian, and Serbian (Cyrillic) languages.
cp1251 (Windows Cyrillic) collations:
cp1251_bin
cp1251_bulgarian_ci
cp1251_general_ci (default)
cp1251_general_cs
cp1251_ukrainian_ci
cp866 (DOS Russian) collations:
cp866_bin
cp866_general_ci (default)
koi8r (KOI8-R Relcom Russian) collations:
koi8r_bin
koi8r_general_ci (default)
koi8u (KOI8-U Ukrainian) collations:
koi8u_bin
koi8u_general_ci (default)