In order to get married in Italy a Russian citizen needs a Nulla Osta which may be obtained by showing the following documents to the Russian Embassy in Italy:

1) 2 original Russian passports;
one for Russia and one for foreign countries;

2) Original Birth Certificate;

If previously divorced/widowed, you need to show your divorce decree or death certificate.

If documents bear different names, you have to show the document where we can see that you changed it officially.

3) Residence permit;

The cost of the certificate is Euro 95 per person.

The couple must apply for the Nulla Osta in person no one else will be allowed in the Embassy or Consulate to assist them.

Here is the link and contacts of the Russian Embassy:

http://www.ambrussia.com/