Disagreements between East and West on questions of regional security in Africa, South West Asia, and South East Asia have, since the mid-1970s, contributed considerably to the deterioration of relations between the United States and the Soviet Union. Moreover, in the current period of poor relations, one of the most plausible avenues to the outbreak of nuclear war is that of escalation from crisis and confrontation in the Third World—specifically in the Middle East, where the interests of the two blocs most clearly intersect.