The Commonwealth was established mainly “to serve further development and strengthening of relations of friendship, good neighborhood, mutual understanding and mutually beneficial cooperation between member states”. Within the above mentioned principles, the member states of the CIS are intended “to coordinate common foreign and security policy, to regulate economic interactions by developing common economic space with a common customs policy, to develop shared transportation and communication networks”. Nevertheless, a short history of CIS existence has showed that abovementioned goals are just great unrealizable wishes. The research question of this paper is to determine whether such theory like neo-functionalism can be used in order to explain processes that have occurred within the CIS. Taking into the whole history of CIS development and the main assumptions of neo-functionalists, this paper argues that because of absence of integration among member states, there is no basis for using neo-functionalism in order to explain the nature of ‘integration’ within the Commonwealth.