Unidentified flying objects cannot be classified as alien space craft until definitive scientific proof is produced.

Just because a flying object is not able to be identified as anything known it does not make sense to declare it to be an alien space craft. If it is not known it is merely unknown, not able to be classified as alien.

It is likely that there are several countries testing prototype craft that will not be well known for quite some time. When Ben Rich (1925 to 1995) retired from being head of Lockheed Martin he stated that the company was working on stuff that will be commercially realised in 40 years but prototypes were being tested. His most famous comment was “We now have the technology to take ET home”.

Do not call a black triangular object with lights at each point a UFO or alien craft. It will almost certainly be a Lockheed Martin TR-3B Astra.
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