CIA afraid of alien attacks

Newly unclassified documents reveal that the CIA is more afraid of the remote possibility of alien invasion than the threat of a Soviet nuclear attack! And I thought I'm crazy. From SMH:

This memo suggested a plot that transcends Stanley Kubrick's Dr Strangelove: the CIA, in the face of unknown phenomena - or even an attack from outer space - was seemingly more concerned about what the Russians might do with UFOs than with the objects themselves. The CIA's interest in the Soviet and Chinese study of UFOs continued for decades. But on October 2, 1952, General Smith received this ominous note from his Office of Scientific Intelligence: "Flying saucers pose two elements of danger which have national security implications. The first involves mass psychological considerations and the second concerns the vulnerability of the US to air attack."