During the transition era, economic resurgence in post-Soviet petro-states, such as Russia and Kazakhstan, was decisively fuelled by an abundance of oil and gas resources during a time of high and long-sustained demand for hydrocarbons in the world market. Thus, these states' energy sectors acted as the cornerstone of their post-Soviet economic and political development. However, in regard to foreign investment in their energy sectors, the governments of the different former Soviet states took strikingly different approaches: Russia for instance imposed restrictions on foreign economic groups, while Kazakhstan was more receptive to foreign investment in the sector. Given their shared economic and political background in the Soviet era discovering what accounts for this policy trend helps understand the divergence in the transition experience and more deeply rooted differences. This policy-oriented study examines perceptions, chiefly by interviews, and foreign investment strategies in the energy sector. It assesses institutional, economic and social background factors shaping perception and, to the degree that it can be determined, policy-making in post-Soviet Russia and Kazakhstan.