Currently Russian (ru) requires 0406 and 0456 (І and і), but these were

Currently Russian (ru) requires 0406 and 0456 (І and і), but these were
    eliminated in Russian in 1918 in favor of 0418 and 0438 (И and и),
    and don't even appear in KOI8-R. (The hypothesis that they don't appear
    in KOI8-R due to their similarity with Latin I and i is eliminated by
    their presence in KOI8-U.) I have a couple of fonts with Russian
    support that don't have the letter.
Therefore, 0406 and 0456 should be removed from or commented out of ru.orth
reviewed by: Keith Packard <keithp@keithp.com>