Cost of living in Krasnodar (Russia) is 19% 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 332 prices entered by 30 different people.
For example, to keep the same standard of living that would require 7,800 zł in Łódź you would need to make just about 6,354 zł (руб 110,558) in Krasnodar.