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 XeTeX
Helper tools for using Cyrillic languages with XeLaTeX and babel.
The LaTeX Project Public License|
|Contained in||TeX Live as xecyr|
|MiKTeX as xecyr|
XeTeX, material supporting it, and packages requiring it|
support languages written using Cyrillic alphabets