A former top US defense official believes UFOs pose a “vital national security issue” — and says America isn’t the only country that’s been grappling with unexplained sightings.

Christopher Mellon, a former deputy assistant secretary of defense for intelligence, said US Navy pilots who recently reported seeing UFOs on a near-daily basis in 2014 and 2015 have legitimate concerns.

“They’re deeply frustrated and that is the core of our show,” Mellon said in an interview with “Fox & Friends” Wednesday, where he pushed his forthcoming History Channel series “Unidentified” about the phenomenon.

“The pilots’ concerns are, one, there have been near-midair collisions, so there is a safety issue,” Mellon continued. “Two, there is a vital national security issue which is that our sovereignty is being violated by vehicles of unknown origin.”

He hinted that the US isn’t alone in its sightings of possible alien life.

“We’re going to be presenting information from a NATO ally that’s been having very similar experiences,” said Mellon.

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