Hi :D
Yes, feh has more dependencies. And it will not work if you not installed all it needs. My apologies...
Now about Russian in the Linux console.
Linux console uses default VGA font that contains only extended ASCII character set (if memory serves me well), and not contain any Russian letters.
Since May, 15 (commit) slitaz-boot-scripts version 5.6.1 recognizes kernel option "font=". It seems like "slitaz-5.0-rc2.iso" dated as "2014-May-19" is released with this feature.
First. I installed tiny package "terminus-font-base" because I like the way letters appeared in the console. And it contains Cyrillic, Greek, and some more letters.
Second. I tweaked my menu.lst to use terminus font on a boot time (really close to the end of boot process).
Note "font=ter-v14n":
title SliTaz full install
rootnoverify (hd0,6)
kernel (hd0,6)/boot/vmlinuz-3.2.53-slitaz rw root=/dev/sda7 lang=ru_UA kmap=ru font=ter-v14n laptop
And note "kmap=ru": I can switch "en ←→ ru" keyboard layout using Ctrl+Shift.