It is true, they are very eastern. Much of it is because their culture was shaped by the Eastern Orthodox Church.
By contrast, it could be said that Poles are a westernized slavic people, due to both the influence of the Catholic Church, and the historic relations with France and the Holy Roman Empire versus with its neighbors to the east.
I would vote for Ivan the Terrible—his nick name would better be translated into “awesome” As a Tsar he was one of the few who really gave a d*mm about his nation. Autocrat, yes, but he built the foundations of Russia for all of its glories and all of its sins.