If she's actually Russian citizen, she cannot do anything for you. Russia does not allow dual-nationality, so if she were an American citizen, she would no longer be Russian.
Have you two met in person, face-to-face? How long have you two spent together where & when & how often? You have to prove a real, in-person relationship - no email pals. Does she earn enough to support self, all dependents, plus you & have a suitable home in the US for you? IF she qualifies, and IF she is willing to petition for your fiancé or spouse visa, expect it to take a year or so to get a visa to enter the US. There are additional requirements to qualify for visa, and possibly for temporary green card. Marriage does NOT get you a regular 10-year green card without remaining married & fulfilling additional requirements.