KOI8-U
From Just Solve the File Format Problem
KOI8-U is an 8-bit character encoding including the Cyrillic alphabet, intended for use with the Ukrainian language. It is an adapted version of KOI8-R with some additional characters added which are used in Ukrainian but not Russian. Character codes 32-126 are identical with the corresponding ASCII characters. Cyrillic characters are ordered in phonetic correspondence to ASCII characters in the bottom half of the code table, not in native alphabetical order. This order is designed to maximize legibility if the 8th bit is stripped.