For marriage in Russia, you will need your passport and the passport of the groom. Also future husband will have to provide a certificate issued by its embassy, that he is not married and has no other obstacles to its conclusion. If the bride has already taken place earlier in other marital relationship, he will need to present a certificate of divorce. It must be apostille - a special stamp to legalize a document in most countries of the world, including in Russia. It can also be put at the consulate of the State whose nationality has a fiance. All documents must be translated into Russian and notarized.
If you still decided to marry abroad, even in Russia will get a certificate from the registry office in the community that have not previously married. Also, check with your spouse or embassy in his country, what other documents may be required from you. Translate them into the language of the country in which you are going. If necessary, will get a special visa of the bride, which is given to people who are going to marry. In some countries, you can create an account and people with normal tourist visa, but in this case it is necessary to return to Russia has to obtain a visa wife. Therefore it is best to issue a special document to enter at a later date without the mess to get a residence permit.