Slavs
Standardised Slavic languages that have official status in at least one country are: Belarusian, Bosnian, Bulgarian, Croatian, Czech, Macedonian, Montenegrin, Polish, Russian, Serbian, Slovak, Slovene, and Ukrainian.
Croats
Curiously enough, the Croats were never obliged to use Latin—rather, they held masses in their own language and used the Glagolitic alphabet. In 1886 it arrived to the Principality of Montenegro, followed by the Kingdom of Serbia in 1914, and the Republic of Czechoslovakia in 1920, but only for feast days of the main patron saints. The 1935 concordat with the Kingdom of Yugoslavia anticipated the introduction of the Church Slavonic for all Croatian regions and throughout the entire state.