This is the 'xecyr' package which is intended to help with Russian and other Cyrillic-based languages in Babel and XeLaTeX.
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xecyr – Using Cyrillic languages in X∃TeX
Helper tools for using Cyrillic languages with X∃LaTeX and babel.
|License||The LaTeX Project Public License|
|Contained in||TeX Live as xecyr|
|MiKTeX as xecyr|
support languages written using Cyrillic alphabets|
X∃TeX, material supporting it, and packages requiring it