To enter the Russian Federation all foreign citizens have to possess a visa.
Tourist visa (Special-Purpose) is the easiest to obtain and is recommended.
The special-purpose tourist visa can be obtained by foreign citizens visiting Russia for non-business reason which means no profit will be gained during their visit. This visa entitles visitors to enter the country to conduct brief business negotiations, attend exhibitions, auctions and medical consultations or examinations.
Please note that in addition to hotel booking an invitation letter is necessary to successfully apply for the visa.
Invitation letters are provided by most hotels after booking. This service is generally free, but depending on the hotel might imply a smaller fee (about $ 25). Obtaining the invitation letters by the hotels is strongly recommended due to positive experiences from the previous conferences.