Why the Pentagon UFO report is deeply troubling for US security experts

If something's out there, let's seek it out, and it is probably a foreign power,' says chair of Senate foreign relations committee

If the idea that we are being visited by aliens seems too much to contemplate, the thesis that the extraordinary-looking craft are the work of terrestrial adversaries seems only slightly less far-fetched - and at the same time, deeply troubling for US security experts.

In pressing for the Pentagon's UFO report to be published, congressional leaders briefed on the intelligence have pointed to the urgent security threat implied by the unexplained aerial phenomena".