Rolling stock for these routes (marked in bold) should be added to the list of what is needed to purchase.
Maxy, where in Ukraine do you think such money for upgrade would be spend with the greatest effect, with a "wow" effect, if not on any of the Odesa lines (where you don't like it because the VIP buses are quicker anyway)?
A lot of such routes: Kyiv -Kryvy Rih,
Dnipro - Kirovohrad,
Kharkiv - Kirovohrad, Odessa - Ternopil, Vinnytsia - Lviv, Vinytsia - Odessa for the beginning (for electric rolling stock).
When KVSZ will manage to produce hybrid of EKr1 and DpKr2 - a lot of other routes can be added to this list, like
Kharkiv - Chernihiv (via Hrebinka),
Kharkiv - Cherkasy (via Hrebinka), Kyiv - Kherson, Odessa - Zhyromyr in farther future -
Kyiv - KP (with travel time ~5:45),
Kyiv - Sumy (~3:55) it's possible to continue very long.
I must be honest - this is
not the list of possible places where easy to achieve really good result on rails, but rather the list of places, where middling result on rails(average 80 km/h or insignificantly more) will be perceived as "wow" just because road condition between those locations are not good => so not only buses sux, but even in some cases with own car it's impossible to compete in speed with such train.