This article examines the impact of foreign diasporas on host country firms. It contributes to diaspora research by focusing on the context of emerging market host countries and the specific case of Chinese diaspora in Russia. Drawing on the concepts of organizational capabilities and organizational legitimacy, we explain how the Chinese diaspora can be beneficial for the competitiveness of Russian firms, and how Russian firms can uniquely leverage these potential benefits through engagement with individual Chinese diasporans and diaspora institutions. Our article adds to the diaspora literature in several ways. First, unlike the majority of past research, which tends to focus on the benefits for the diaspora's home country, we highlight the potential impact on host country firms, specifically their capabilities and legitimacy at home and abroad. Second, our model can be viewed as a direct response to the many calls in the literature to study the microfoundations of firms’ capabilities. Third, we add to the legitimacy literature by proposing that engagement with a foreign diaspora can help host country firms establish and maintain their legitimacy both at home and on a global scale. Although our framework is informed by the Chinese diaspora in Russia, we discuss its generalizability to other contexts.