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.
Modern history of Ukraine
Ukraine officially declared itself an independent state on August 24, 1991, when the communist Supreme Soviet (parliament) of Ukraine proclaimed that Ukraine will no longer follow the laws of USSR and only the laws of the Ukrainian SSR, de facto declaring Ukraine's independence from the Soviet Union. On December 1, Ukrainian voters overwhelmingly approved a referendum formalising independence from the Soviet Union. Over 90% of Ukrainian citizens voted for independence, with majorities in every region, including 56% in Crimea, which had a 75% ethnic Russian population. The Soviet Union formally ceased to exist on December 26, when the presidents of Ukraine, Belarus and Russia (the founding members of the USSR) met in Belovezh Pushcha to formally dissolve the Union in accordance with the Soviet Constitution. And with this Ukraine's independence was formalized de jure and recognised by the international community.