Central Treaty Organization
Turkey was a founding member of the Central Treaty Organization (CENTO) collective defense pact established in 1955, and endorsed the principles of the 1957 Eisenhower Doctrine. In the 1950s and 1960s, Turkey generally cooperated with other United States allies in the Middle East (Iran, Israel, and Jordan) to contain the influence of countries (Egypt, Iraq, and Syria) regarded as Soviet clients. Throughout the Cold War, Turkey was the bulwark of NATO's southeastern flank and directly bordered Warsaw Pact countries.