I think, they should learn a little geography first. Then they will understand better.According to tripsavvy.com/countries-of-eastern-europe-explored-1501460 Eastern European countries are:
But according to Wikipedia all countries on Balkan peninsula as well as Armenia, Azerbaijan, Georgia are also Eastern European countries. I guess because geographical Europe sweeps from the Iberian peninsula to the Ural Mountains
- Russia
- Czech Republic
- Poland
- Croatia
- Slovakia
- Hungary
- Romania and Moldova
- Serbia
- Lithuania, Latvia and Estonia
- Slovenia
- Bulgaria
- Ukraine and Belarus
- Montenegro, Bosnia and Herzegovina
- Albania, Kosovo, and Macedonia