" The Soviet system had left many valuable legacies—a huge network of large industrial enterprises (though stranded in the 1960s in terms of technology); a vast military machine; and an extraordinary reservoir of scientific, mathematical, and technical talent, although disconnected from a commercial economy. The highly capable oil industry was burdened with an ageing infrastructure. Below ground lay all the enormous riches in the form of petroleum and other raw materials that Gorbachev had cited in his farewell address "

― Daniel Yergin , The Quest: Energy, Security, and the Remaking of the Modern World