SIBERIAN air traffic controllers claim that a female-sounding alien spoke to them in a cat-like language.

They say that a mysterious object - which they believe was a high-speed UFO - appeared on flight monitors over the remote Russian city of Yakutsk, the Daily Mail reported.

It rapidly changed direction in the sky and reached speeds of nearly 1000km/h - surrounding planes were seen to be travelling significantly slower.

The aviation workers tried to make contact with the ship, as evident in a video posted to YouTube.

"I kept hearing some female voice, as if a woman was saying mioaw-mioaw all the time," one air traffic controller told the pilot of a passing Aeroflot flight.

The UFO was automatically designated as "00000" as it did not have a flight number.

Airport officials have not commented on the footage.

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