No Ukrainian here, but from a tourist perspective arriving in Kiev by train and riding around with the Metro and the Marshrutki (is that the Ukrainian plural? I only know some Russian) was comfy as fuck.
Obviously everything is a little run down and many systems only continue to exist because soviet technology was built to last, but it makes me happy to see how good of a transport system can be held up with so little, especially looking at Marshrutki. Also why are the Trolleybuses so slow? Bad shape of the catenary?
Also it appears that you can get by without a car in most larger cities (well, many people just have to), also there is a network of night trains connecting the country.
I know you can frame it the other way aswell: Night trains are only there be because the bad Infrastructure enforces low speeds, even suburban trains only run a handful times a day, UZ is being eaten up by corruption, there is little money for improvements, Kiev Metro has capacity issues during peak hours I haven‘t even seen in Tokyo and and and...
But from a transit nerds perspective Ukraine has a lot of potential and is probably already better than most countries worldwide, overhaul the existing tram and Trolleybus networks for higher speeds, add some live departure information to the Marshrutki and then you‘ll have some really decent transit.