If you're a student and also the regional University in the nation you're traveling to have extended an invitation for you to research there, then it is possible to apply for a study visa. As an example, you are supposed to research in France you'd find a French visa that would make it possible for you to study there.
The visa is only going to be valid for the length of the course or courses which you're taking. Additionally, it doesn't give you permission to operate there or run another type of company in this country. For more information about visa regulations for Russia, you can explore https://www.rusvisaonline.com/en/services/business-invitation/index. You'll require the invitation to the University, a passport, image ids and program form as the minimal requirements.
Company visa requires you have an invitation from an organization in the country which you're traveling to. The quantity of documentation required can be a good deal more. You might want to offer a letter in the business, evidence of coverslips, travel insurance and evidence of travel lodging.
A tourist visa may be issued to the majority of people with only a passport, two photograph ids and an application form for the majority of states. But some nations are really stringent on a tourist visa. A Russian visa is 1 case of being quite strict.
If you're going to be staying at a resort, the reservations have to be verified. As soon as they are verified then a tourist invitation could be extended for you and you're able to begin the procedure.