I agree, and the option to change servers is misleading because they all are "seen" by websites as being in eu, or ua with google.
I also get different results with the different browser reflector sites.
These two are good.
https://browserleaks.com/ip
https://whoer.net/#extended
It is probably the geoip data base they use, but most web sites will see your location as sweden or central eu.
But not google - even the local city hall site with a google widget on it displays in Ukrainian within the widget. So, you have to change language on most google sites or widgets/signons:
український with an arrow to open drop down list
or
мова on a menu
That is as good as it gets, unfortunately.
See also https://forums.opera.com/post/157572