I don't want to dispel your fairy tale, but ...
For example Erste bank. Large, European, with good reputation. Huh?
Was in Ukraine since 2006, rebrands at 2014 (for remove theoretical ties with mother bank?), 2016 liquidated.
You could just google which EU/World banks tried to get into market of UA.
Over decades a LOT of world largest banks are come to Ukraine and then leave. Only few︀ left. Nobody care about reputation.
It's a just a business, where traditional banks are not︁ found in high-risk Ukraine enough appliance. And it's a only matter of time and cost︂ when EU banks will be unprofitable, rebrand branch and leave country.