The "New Look" foreign policy of the Eisenhower administration focused on brinkmanship and massive retaliation using nuclear weapons as a deterrent against communist expansion. It advocated threatening nuclear attacks to push communist countries back behind their pre-1945 borders and interfering in communist governments through covert CIA operations. The policy was based on the domino theory that if one country fell to communism it could trigger surrounding countries to also fall like a line of falling dominoes.