Purpose: Identification of the heuristic significance of radicalism and solidarity as elements of the Russian civilization concept, not only within the framework of a unified, strictly fixed theory, but as universal intellectual tools of a modern socio-humanitarian vision of historical reality. Methodology: The basis of the work is a civilizational approach, which allowed to most effectively evaluate the interesting aspects of the social development of Russian civilization. Main Findings: The authors revealed the specific content of national manifestations of radicalism and solidarity in a philosophical and historical context. The most important manifestations of the social aspirations of key mega-objects of Russian history: the ethnic group, the state and the church are analyzed. When considering the historical specifics of the designated vectors of civilizational dynamics, attention is drawn to the role of individuals in the process of activating or deactivating the indicated directions of Russia development. Novelty/Originality: The authors revealed the specific content of national manifestations of radicalism and solidarity in a philosophical and historical context. The tendency towards radical and solidary forms of interaction among the participants in the civilization process, especially at the tragic moments of historical changes, was a special form of manifestation of social dynamics. Its total completeness, expressed, among other things, through the acceleration or deceleration of the adaptation to historical reality processes, became a state of self-disclosure of specific subjects of social action, acting as vehicles of unknown metahistorical forces.