Prior to the Iranian Revolution, the two countries constituted the Nixon Doctrine's "twin pillar" policy in the Middle East. The monarchies, particularly Iran since the US-led coup in 1953, were allied with the US to ensure stability in the Gulf region and act as a bulwark against Soviet influence during the Arab Cold War between Saudi Arabia and Egypt under Gamal Abdel Nasser. The alliance acted as a moderating influence on Saudi-Iranian relations.