Pure Ukrainian is actually quite different from Russian.
It’s weird because some words are the same, some are kind of similar, and some are utterly different:
An iron you iron with in Russian for example is a “utyug”
In Ukrainian it’s a “praska”!
And the months of the year are totally different
The thing is most people don’t speak “pure Ukrainian” but “surzhik” which is a mixture. Mind you in the west, where I’ve never been, it’s probably different