To apply for any type of a Russian visa, you must have an invitation – a document confirming that you are invited to Russia by a tourist organization, a hotel, an individual or a company. Tourist invitations can be issued by the accredited organizations registered in the Federal Register of Tourist Agencies of Rostourism. Business invitations are issued by the inviting organizations that have this right from the Ministry of Foreign Affairs. A private invitation can be prepared by an individual you are planning to visit in Russia through the Gosuslugi portal.