Hello, friend. I've noticed your comment and decided to share my thoughts and knowledge in this sphere. I am in the opposite situation. I was living in Russian Federation for about 20 years. Then I decided to move to the US for studying. Of course, I am still a citizen of that country. Moreover, to travel abroad you have to have a second passport. It is valid for either 5 or 10 years. When the dates are expiring, you have to renew the passport. Otherwise, you will not be able to travel outside Russia. I renewed my 10-year russian passport being here in the USA with the help of this service https://www.russia-travel.com/passport/. As I know, they are also into Russian vasas. So, probably you may call them and ask about the documents you need to get your visa.