https://docs.aws.amazon.com/polly/lates ... guage.html
So that is probably the explanation why it sounds so bad.
- leave such phrasing/subjects outside this forum (first and last warning),
- you don't like it, perfect, spend time to make it better.
- no, it won't be removed because that doesn't please you.
- and yes, there is no Ukrainian voice available, hence the guy who added this voice support used Russian ones.