Slavs
Slavs can be further grouped by religion. Orthodox Christianity is practiced by the majority of Slavs. The Orthodox Slavs include the Belarusians, Bulgarians, Macedonians, Montenegrins, Russians, Serbs, and Ukrainians and are defined by Orthodox customs and Cyrillic script as well as their cultural connection to the Byzantine Empire (Serbs also use Latin script on equal terms). Their second most common religion is Roman Catholicism. The Catholic Slavs include Croats, Czechs, Kashubs, Moravians, Poles, Silesians, Slovaks, Slovenes, and Sorbs and are defined by their Latinate influence and heritage and connection to Western Europe. There are also substantial Protestant and Lutheran minorities especially amongst the West Slavs, such as the historical Bohemian (Czech) Hussites.
Ukrainian People's Republic of Soviets
The Ukrainian People's Republic of Soviets (1917–1918) was a short-lived Soviet republic of the Russian SFSR that was created by the declaration of the Kharkiv All-Ukrainian Congress of Soviets "About the self-determination of Ukraine" on in the Noble Assembly building in Kharkiv. The republic was later united into the Ukrainian Soviet Republic and, eventually, liquidated, because of a cessation of support from the government of the Russian SFSR when the Treaty of Brest-Litovsk was signed.