States are closely connected with each other in the modern world. This interconnection is due to the objective necessity for all of them to enter into certain relations. Peaceful co-existence of states with different economic and social systems determines the growing significance of co-operation between them. The necessity for cooperation can be explained not only from the economic point of view but also by the fact that a number of crises in the international intercourse still remain unregulated, thus presenting a threat to maintenance of the peace in many parts of the world.