The theoretical research and overview of the foreign policy is one of the conditions in order one state to have sustainable and beneficial foreign policy. In this context, the theoretical knowledge about the relations between the foreign policy and other relevant factors can be sometimes crucial for the success of the foreign policy of one particular country. This paper presents the relations of the foreign policy towards the diplomacy, but also towards the domestic policy and the degree of dependence in shaping a foreign policy with character of political system. However, this paper deals with the changes in the international relations and their impact on the foreign policy.