They were Russian, Bob. They spoke Russian, they lived their lives speaking Russian. They moved to Ukrainian SSR under Soviet times, then woke up one morning in 1991 and found they were no longer in Russia.
But it was OK, because Russia was an officially recognised language, and they could still conduct business in Russian, their kids could go to school and learn Russian, and they could live their lives in Russian - until they couldn't:
"Ukraine passes law against Russian language in official settings"
And yes, you are correct. Zelensky was a Jew who grew up speaking Russian. He had to LEARN UKRAINIAN in order to be elected.
Just like he had to learn how to be a good NAZI.