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The defence ministry in Moscow this week proudly posted footage of an attack by Pacific Fleet submarine Tomsk on a ship 93 miles away in the Sea of Okhotsk.

It was the latest of a series of videos highlighting the country’s military might – but all is not as it seems.

Eagle-eyed Russian watchers soon mocked the video.

They pointed out that the footage of the training strike had been originally broadcast on TV Zvezda – owned by the ministry – almost two years ago.

At the time it was described as a Moskit missile strike on a ship posing as an enemy off Crimea in the Black Sea.