Cost of living in Krasnodar (Russia) is 21% 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 328 prices entered by 29 different people.
For example, to keep the same standard of living that would require 9,300 zł in Łódź you would need to make just about 7,369 zł (руб 127,390) in Krasnodar.