It wasn't then nor now a legitimate parliament. Please refer to the 2014 Victoria Nuland phone leaks to see for yourself how the United States chooses who is a member of the Ukrainian government.
Nothing in that leak shows that the US chooses members of the Ukrainian government, only that they work with them. All of them were democratically elected, just like Zelensky. Next you're going to tell me that Yatsenyuk grew a beard and joined a Chechen gang in the 90s and cite the DNC leaks as proof. https://www.voanews.com/a/ukraine-yatsenyuk-chechnya-russia-...
https://www.bbc.com/news/world-europe-26079957