Cost of living in Essen (Germany) is 129% 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 143 prices entered by 16 different people.
For example, you would need at least руб 275,179 (€3,620) in Essen to maintain the same standard of living that you can have with руб 120,000 in Nizhniy Novgorod.