Cost of living in Essen (Germany) is 119% more expensive than in Nizhniy Novgorod (Russia)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 303 prices entered by 25 different people.
For example, you would need at least руб 251,522 (€3,344) in Essen to maintain the same standard of living that you can have with руб 115,000 in Nizhniy Novgorod.