According wiki: http://en.wikipedia.org/wiki/Cyrillic_alph..._and_typography then pasting those characters in some online Cyrillic-Latin Encoder like this for example: http://www.uni-bonn.de/~manfear/cyrlatencoder.php results in this:
а-б-в-г-д-е-ё-ж-з-и-й-к-л-м-н-о-п-р-с-т-у-ф-х-ц-ч-ш-щ-ъ-ы-ь-э-ю-я
a-b-v-g-d-e-ё-zh-z-i-j-k-l-m-n-o-p-r-s-t-u-f-h-c-ch-sh-sht-y-ы-j-э-ju-ja
А-Б-В-Г-Д-Е-Ё-Ж-З-И-Й-К-Л-М-Н-О-П-Р-С-Т-У-Ф-Х-Ц-Ч-Ш-Щ-Ъ-Ы-Ь-Э-Ю-Я
A-B-V-G-D-E-Ё-Zh-Z-I-J-K-L-M-N-O-P-R-S-T-U-F-H-C-Ch-Sh-Sht-Y-Ы-J-Э-Ju-Ja
Now you can simply use $replace() function and above mappings (maybe someone from Russia can comment?)
$replace(%title%,А,A,Б,B,В,V,Г,G,Д,D,Е,E,Ж,Zh,З,Z,И,I,Й,J,К,K,Л,L,М,M,Н,N,О,O,П,P,Р,R,С,S,Т,T,У,U,Ф,F,Х,H,Ц,C,Ч,Ch,Ш,Sh,Щ,Sht,Ъ,Y,Ь,J,Ю,Ju,Я,Ja,а,a,б,b,в,v,г,g,д,d,е,e,ж,zh,з,z,и,i,й,j,к,k,л,l,м,m,н,n,о,o,п,p,р,r,с,s,т,t,у,u,ф,f,х,h,ц,c,ч,ch,ш,sh,щ,sht,ъ,y,ь,j,ю,ju,я,ja)
If foobar doesn't show correctly Cyrillic characters, first use foo_chacon as suggested
Hope it helps