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A number of queries will be raised in this research paper, regarding the mechanism and utility of international regional organizations. We will address ourselves, trying to look for a clue that why Pakistan joined these organizations; both security related and groupings with economic preferences. We would investigate the rationale for Pakistani membership as well as the diminishing results of these regional groupings. In the era of Cold War, i.e. 1950s to 1970s, the focal point of Pakistan’s foreign policy remained in cooperation with the regional countries for the uplift of its security needs; not withstanding that Southeast Asia Treaty Organization (SEATO) and Central Treaty Organization (CENTO) were American sponsored. However, we cannot ignore the fact that co-members like Iran and Turkey were Pakistan’s closest allies; regardless of the fact that these three countries coordinated their policies within the grand design of American containment of the communist ideology.