If foreign nationals obtain a Russian visa, it gives him legal right to cross borders of the Russian Federation for purposes of stay, which he has indicated in his visa application. Visa registration is an internal structured process and even the slightest violation can lead to a refusal by consular authorities.
What do you need a visa for?
Russian visa provides a right of entry to the country and staying in the Russian Federation within the period allowed. At the same time, the key characteristics of the given document are its time frame and purpose(s) of the journey. Violation of the allowed length of stay or declared purposes entails prosecution and deportation.
Pay attention! The purposes you are declaring can’t be changed after the visa registration. That’s why you need to identify them as clear as you can during the preparation of documents.