In the final months of the negotiations between the United States and various Western European countries that culminated in the signing of the North Atlantic Treaty on April 4, the question arose of United States support for the security of Greece, Turkey, and Iran. As early as January 25, the Department of State had informed the Iranian Ambassador that it recognized that the United States must avoid giving a false impression that, by the commitment to Western Europe, it was abandoning Iran (see telegram 86, February 1, to Tehran, volume IV, page 62).
Consideration was given to issuing a formal United States declaration
supporting the security of the three Near Eastern countries. On
April 2, however, the Department informed the American embassies
concerned that it had decided not to issue a formal declaration but
to rely instead on previous and future public statements by
President Truman, Secretary Acheson, and Foreign Secretary Bevin to
reassure Greece, Turkey, and Iran of continued American and British
interest in their security (see circular telegram of April 2,
ibid., page 270).