First of all, you need a letter of invitation. Please contact your coordinator at your university, they will help you with this.
Once you have received your letter of invitation, you have to apply for a visa. You can go directly to the Embassy of the Russian Federation in your country. But it is simpler to go through an agency. You will have to pay the agency a fee but you will avoid queuing at the Embassy. Within around 15 days, you will receive your visa (within 5 to7 days if you pay an extra fee).
The agency will tell you which documents are required, but you will need:
Do not forget to also take out insurance for your stay. For this, you can contact a visa agency who will give you a list of all the insurance companies recognised by the Russian Federation.
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