Ukrainian is the official language of Ukraine.
I think Ukrainian language may be taken as Russian language. Well, there are some similarities (e.g., both languages use Cyrillic alphabet) but they not identical! The other thing that may led to this confusion – Russian language is widely spoken in Ukraine and many Ukrainians can speak Russian.
Dziś są tacy, którzy mówią po rosyjsku, ale nie chcą.
wcale się nie dziwię…
Serdecznie pozdrawiam!