To visit Russia, you should apply for a humanitarian visa (cultural, scientific or technical purposes). For that, you need a visa letter from the hosting organization, written in Russian.
To receive the visa letter from the hosting institute (IITP RAS), please fill out the form. The letter will be sent to you by email. The next step will be your applying for the visa at the Russian Consulate or Official Visa Centers in your country using this visa support letter (typically, a copy is enough) together with other required documents (the terms, and fees vary by country).
If you have other questions, please contact Ekaterina Guzha at email@example.com.