Ukrainian (українська мова - ukrajinśka mova,український, украинский, Ukrainisch) is an East Slavic language thatuses a variant of the Cyrillic script. It is the official state language of Ukraine and first of two principal languages of Ukrainians.
Russian (русский язык - russkiy yazyk, Російська мова, Russisch) is an East Slavic language native to Eastern Europe, and is used widely throughout Ukraine and other countries, including Caucasus, Central Asia, the Baltic states, Israel, and Mongolia.