When one of the future spouses is a foreigner, ZAGS is required to act according to international agreements, that is, require additional documents that are needed by the embassy of the foreigner's native country. Generally, you'll need to stay in Russia at least for 2 months to be able to get all the documents needed and to book a wedding date, alternatively, you'll need to come at least twice for a couple of weeks.
Surprisingly, this time it's not Russian bureaucracy needing them, but a native country of the foreign husband or wife.
Russian culture has a long and rich history, steeped in literature, ballet, painting and classical music. Every culture has a different set of standards when it comes to things like marriage and the relationships between men and women. Russian traditional wedding is different from what people are used to in the United States of America, Canada, Mexico or Europe. The modern tradition of a Russian wedding in many ways consonant with the traditions of past centuries and with the habits of the Soviet era.
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For the latest information, please, contact the embassy of your native country (see Moscow Guide / Embassies).
For a foreigner: a Russian visa (any kind – tourist, business, private, student), a passport, a marital status paper from the embassy (also called "Certificate de Marriage" in France or "Certificate of No Impediment to Marriage" in England).