Ukraine's standard of living is very low, so it is difficult to compare directly with a middle class in a Western country. But by "educated middle class" I mean, roughly, college graduates, white collar workers, engineers, teachers (many quite poor by our standards!) The kinds of people that make a living in a way a middle class person does, and that have received a certain basic education level.

How many percent of the population would you count into that class?

I am not sure. I think at most half of the population is middle class, and some proportion of this is educated. Maybe 10-20% of the overall population? This is me shooting from the hip.