Can't work with files named with russian characters

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http://askubuntu.com – After saving file in LibreOffice with russian name it displays in Nautilus like "??????.odt". This file correctly opens in LibreOffice, but with "??????.odt" title in titlebar. Another side of problem - when I create file with russian name in Nautilus (for example, I'm renaming english filename in russian), it doesn't open in LibreOffice with an error " /home/..../???????.odt doesn't exists". In Nautilus filename displays correctly. The error also involves Dropbox - it doesn't sync files with russian filenames, but dropbox agent shows "All files up to date". The error exists not only in ho (HowTos)