USSR didn't try to "exterminate" Ukrainian, where did you get this? We spoke Ukrainian all my childhood, it was taught at school, there were TV shows, magazines and newspapers in Ukrainian. It was alive and very actively used, at least in 80's.
> I’m going to choose to believe the folks I’ve met
It's totally up to you who to believe. Just make sure that what they say matches reality. And reality is that Russian is still used in majority of Ukrainian companies as standard language, even after 30+ years of independence. We work with contractors from Ukraine and they all communicate in Russian perfectly well.
I just looked it up and it appears that wasn't something the USSR ever really did.