Visa is a document issued on the basis of an invitation to enter the Russian Federation. It determines how long a foreign citizen can stay in Russia. Russia requires you to get an official visa support or “invitation” before you can apply for the visa to the Consulate. The most common visa that our guests use is a tourist visa. There are single-entry and double-entry tourist visas and they usually last for 3 months. You can not enter Russia prior to the day stated on your visa.
Get more information about Russian visas on our site
Ministry of foreign Affairs official site