Hey, Klopp.
Great website specially for you NUMBEO . com
Cost of Living

(for instance
Cost of Living Comparison Between Saint Petersburg, Russia And Stockholm, Sweden)

Just take into account that

1.someone (me) might not need any cigarettes, which are - morover -extremely expensive in Scandinavia due to gov. monopoly.
2. cars in Sweden are muuuuch cheaper (no stupid 70 % fee) than in Russia and its condition could differ a lot because russian roads is another side of the moon...

So, check the figures carefully.

Of course, you can conduct the comparison among russian cities as well:
http://www.numbeo.com/cost-of-living...rg&city2=Kazan

(SPb- the city of Kazan)
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And if you wish exact answer without any bothering - then roughly

Moscow basic average salary: 30 000 rubles ($ 833)
St Petersburg: 25 000 rubles ($ 694)
Other Russia (ex. Yekaterinburg): 20 000 rubles ($ 555)

Rent and everything else change gradually among these three "peaks" correspondingly.