In Microsoft, the Russification project manager and one of its main developers was Nikolai Lyubovny (Николай Любовный).
[1][2] A Russian version of MS-DOS 5.0 was also developed in 1991,[1] released on 9 August 1991 (1991-08-09).
Based on an initiative of Microsoft Germany in March 1991, derivates of the Russian MS-DOS 5.0 drivers used for keyboard, display and printer localization support (DISPLAY.SYS, EGS.CPI, EGA2.CPI, KEYB.COM, KEYBOARD.SYS, MSPRINT.SYS, COUNTRY.SYS, ALPHA.EXE) could also be purchased separately (with English messages) as part of Microsoft's AlphabetPlus kit.
This enabled English issues of MS-DOS 3.3, 4.01 and 5.0 to be set up for Eastern European countries like Czechoslovakia, Poland, Hungary, Yugoslavia, Romania and Bulgaria.
[1] A comprehensive instruction set for computer Russification is maintained by Paul Gorodyansky.