Turkey was governed under the idea of “peace at home, peace in the world.” after establishment of Republic. This was a realist idea on the foreign policy because Turkey was not able to act aggressive to be more prestigious state in the eyes of Western powers. Realpolitik was successfully implemented by founders of Turkey in these years. Turkey wanted to integrate international system as an equal and independent actor. In the circumstances, the best way for integration was becoming a part of international organization as a necessity of Realpolitik. That research will include two parts which are relations with member states of the Pact from establishment of Republic to signing the Pact and necessities of the Pact for Turkey.