The Cyrillic Language Kit supports several Slavic Languages using different variations of the Cyrillic alphabet.
Apple's Cyrillic Language Kit includes two cards, scored for folding in half, to show the Russian, Cyrillic-QWERTY, Cyrillique-AZERTY, and Kyrillisch-QWERTZ layouts. Additionally, there are keyboard stick-ons for Russian, Ukrainian, and Bulgarian. There is no need for stick-ons if using a transliterated keyboard. The manual also includes all the layouts, as well as a transliteration guide (with the names of the letters and a hex table).
There are two separate installations one for English and one for French computers. The following keyboards layouts are available (if all are installed) from the keyboard menu:
Russian
This is referred to in the manual as Russian Normal. This is the one Russians would use, or learn in school. In other words, it is their version of the QWERTY keyboard used in the U.S. It includes "Option" and "Option-Shift" key layouts for additional letters used in the Ukrainian, Belorussian, Macedonian, or Serbian.
Cyrillic-QWERTY
This is a transliteration of the American English QWERTY keyboard. Transliteration means that if I type Xris (Russian for Chris, the "x" is a gutteral "h" sound), the correct Cyrillic characters are produced. This would be used by English QWERTY keyboard users who do not know the "native" Cyrillic keyboard layouts (Russian, Ukranian or Bulgarian). It also includes the "Option" and "Option-Shift" layouts.
Cyrillique-AZERTY
This is the transliteration for the French keyboard. It also includes "Option" and "Option-Shift" layouts.
Kyrillisch-QWERTZ
This is the transliteration for the German keyboard. It also includes "Option" and "Option-Shift" layouts.
Ukrainian
This keyboard layout includes some "Option" and "Option-Shift" letters.
Bulgarian
This keyboard layout includes some "Option" and "Option-Shift" letters.