About Russian letters
Russian has 33 Cyrillic letters. The standard ЙЦУКЕН layout is not phonetic, so English speakers often prefer a phonetic layout (Russian - Mnemonic on Windows, Russian - Phonetic on Mac) where а is on A and б is on B.
The letter ё is often written as е in running text, but it is a separate letter with its own key at the top left.
Cyrillic letters have no Alt codes under 256; in Word type the hex code (0430 for а) then Alt+X.
Russian letters: names and codes
Every letter with its name and Unicode code point. None of these have classic Alt codes; in Word type the hex code and press Alt+X, or use the HTML code on web pages. Click a letter to copy it.