You need a visa for Russia if you have a Belgian passport
Visa options for Russia
Electronic visa (eVisa)
Electronic visitor visa
Travelers need a visa to visit Russia for Business or Tourism. An eVisa is the fastest and easiest way of obtaining a visa for Russia because travelers can submit their applications and supporting documents online. Once the application is approved, travelers receive their eVisa confirmation electronically. A valid visa is required to board the flight. If the visa is expired or doesn’t match the traveler’s passport information, travelers will not be able to board their flight.
This is not offered by sherpa°.
Apply on the government site.
