Boris Nadezhdin is not allowed to run against Putin. The official reason for this was formal errors in the candidate's signature documents.
The 60-year-old represents liberal positions and has repeatedly spoken out publicly against the continuation of Russia's war of aggression against Ukraine. Vladimir Putin wants to be confirmed in office again in the presidential election in mid-March. He has little to do with an election; the politicians who have already been admitted are all loyal to the Kremlin and are therefore counted as candidates.