Claim: Photo Captures UFO Intercepted by UK’s Royal Air Force over Syria.

[Mendel]

This company has been making similar unmanned aerial platforms since the 1970s.
https://de.wikipedia.org/wiki/Dornier_Kiebitz
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This particular helicopter-based platform was tethered (300m/1000ft), including a fuel line. However, none of the protypes of this model or its untethered successors ever made it into service.