An AI-powered , humanoid robot that was meant to signal the next big Russian tech advance went sour in Moscow after literally falling flat on its "face".

The robot, dubbed AIdol, made its public debut at an event staged by manufacturer Idol.

Video showed the robot taking a slow few steps onstage.

It raises its right "arm" for a wave and appears to waver, with handlers approaching rapidly.

But AIdol managed to stay upright for a few more steps before apparently overbalancing and falling forward.

The handlers rush to lift the robot up, at the same time as another is drawing a black sheet in front of the scene.

Idol chief exectuive Vladimir Vitukhin said the fall was caused by calibration errors and that the robot remained in its testing phase, according to media reports.

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