Cost of living in Krasnodar (Russia) is 20% cheaper than in Łódź (Poland)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 285 prices entered by 26 different people.
For example, to keep the same standard of living that would require 7,100 zł in Łódź you would need to make just about 5,684 zł (руб 103,267) in Krasnodar.