# dpkg-reconfigure console-setup

        Keyboard Model:                   Generic 102-key (Intl) PC
        Origing of the keyboard:          Russia
        ...
        Encoding to use on the console:   UTF-8
        Character set to support:         Cyrillic - KOI8-R and KOI8-U
        ... 

# cat /etc/rc.conf

...
font8x16="cp866-8x16"
scrnmap="koi8-r2cp866"
keymap="ru.koi8-r"
...

# /etc/rc.d/syscons restart

freebsd8# sed -i.bak 's/cons25/cons25r/' /etc/ttys

# kill -1 1