It depends on who you are. If you are a person of authority who needs to verify someone's identity, then you would have to contact a russian embassy or consulate general that is closest to you and hope for their cooperation.\n\nIf you just know a passport number of a russian citizen and need to verify it, you can try contacting the consulate as well, but chances are they will not be very forthcoming with information since such matters are confidential.
Is it possible to verify a russian passport with the passport number if i'm in canada?