The article considers the need of ensuring the sustainable development of organizations in the unstable external environment; financial sustainability which is understood as the optimal structure of funding sources of a business entity is proved to be the most significant factor of sustainable development. The article proves that the index of financial leverage influences the enterprises capital structure which also has a great impact on financial sustainability of Russian organization. The index of financial leverage was analyzed according to the European approach and taking into account such indicators as differential of financial leverage and financial leverage shoulder which are proved to be the most significant in capital structure management for Russian production companies under the circumstances when financial resources become more and more expensive. The research work was done on the basis of financial analysis of one of the biggest Russian automobile company representing the main trends for the whole industry so it may be classified as a case.