By the early seventeenth century the collapse of world-system ties of the Mongolian world was accompanied by formation of a multitude of fragmented alliances. The shaping of Mongolian territories in Central and East Asia was a result of complex alternations of the main world-systems and centers. Domination of the millennium-and-a-half old nomadic communities in the core world centers ended up with the collapse of the Mongolian Empire. A huge area populated by the Mongolianspeaking peoples turned into an object of repartition by new polities and communities. A powerful successor, the Manchu state, managed to tighten up its grip on the Mongolian world using systemic contradictions and an ancient maxim “divide et impera”. The Manchus distributed the contradictions of the competitors to their advantage. The evolution of Mongolian collapse turned inevitable. The incorporation of Buryatia into Russia was a life-changing event in the history of Buryatia and its indigenous peoples. It changed the entire course of history of the Buryat people and to a large extent predetermined their destiny. Thanks to Buryatia it became possible to establish full-scale contacts with the East through interactions with the Buddhist culture and religion.