Russian language in FosWiki?

Question

Wiki engines

I'm trying to set up the latest version of FosWiki to understand Russian in WikiWords.
When I enable LocaleRegexes=1, UseLocale=1, Site Locale=ru_RU.utf8 Russian words are not recognized as WikiWords. If LocaleRegexes=0 and fill UpperNational and LowerNational with Russian letters, then all Russian words are recognized as WikiWords and are links regardless of case.
Has anyone already experienced this?

# uname-a
Linux wiki 3.2.0-24-virtual #37-Ubuntu SMP Wed Apr 25 12:51:49 UTC 2012 
i686 i686 i386 GNU/Linux

# perl-v

This is a perl 5, version 14, subversion 2 (v5.14.2) built for 
i686-linux-gnu-thread-multi-64int
(with 56 registered patches, see perl-V for more detail)

# locale
LANG=en_US.UTF-8
LANGUAGE=en_US:en
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

# locale-a
C
C.UTF-8
en_AG
en_AG.utf8
en_AU.utf8
en_BW.utf8
en_CA.utf8
en_DK.utf8
en_GB.utf8
en_HK.utf8
en_IE.utf8
en_IN
en_IN.utf8
en_NG
en_NG.utf8
en_NZ.utf8
en_PH.utf8
en_SG.utf8
en_US.iso88591
en_US.utf8
en_ZA.utf8
en_ZM
en_ZM.utf8
en_ZW.utf8
POSIX
ru_RU.iso88591
ru_RU.iso88595
ru_RU.utf8
ru_UA.utf8