When you have found your Russian love and decided to get married, what is the right way to do it?
In this situation, she will have to apply for a special immigrant visa, which is called "K1-fiancée visa." Start searching for the information at the official US Embassy site in Moscow, or type the word-combination "k1-fiancée visa" in any search service online. The most crucial thing you both will have to do is keeping track of all documentation proving that your relations have been serious. These can be your emails to each other, pictures together, travel tickets, phone and hotel bills that provide the information about your relationship and visits to Russia (or other country). The photos and documents with your names on them would convince the Consulate officer that your connection is not fake, and there is no evidence of sham marriage (e.g. for the purpose of getting green card).
Learn carefully about all the official requirements and documents needed for the application for the K1-fiancée visa at different visa services and support sites, especially that of the US Embassy in Moscow.
Keep it in mind that once she gets her K1-fiancée visa approved, you need to get married during 90 days since then. Otherwise, she will have to return to her country.
