Ukraine is poor for sure, at least by European standards.
GDP per capita is ~$4.3k, similar to countries like Namibia and Mongolia.
Russia is around $11k. Bulgaria is the lowest EU country again at ~$11k. UK is ~$45k
en.wikipedia.org
Corruption is rather more subjective I guess, but there is a corruption index.
Ukraine ranks #117, not much better than Russia #129. UK is #11, with Denmark and NZ in the lead.
How does your country measure up in the 2020 Corruption Perceptions Index?
www.transparency.org