Thank you Claudio, all understood.

Claudio Beccari wrote:
> Your XeLaTeX MWE has \hyphenation in the wrong place.  The explanation is 
> that the \hyphenation exceptions introduced with command \hyphenation are 
> connected with the current language. The russian language, the only one 
> specified after polyglossia, becomes active only after \begin{document}; 
> before that the default language is language 0, that is english.
Philip Taylor

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