So no love for Roslavets?
Well, maybe it's just the difficulty of establishing what "Ukrainian" means. Just as well that that kind of thing is difficult.
But the one who springs most readily to my mind, Kotra, was born in Kiev. So there's that.
Kotra is the nom de plume of Dmytro Fedorenko, who also runs two record labels in Ukraine, Kvitnu, which he founded, and Nexsound, which Andrey Kirichenko founded.
My first album of Kotra's was dissilient.

Here's a track from that, with a colorful video to go along with it:
https://vimeo.com/24862240