Semi-naked Russian cadets spark 'Satisfaction Challenge'

A controversial online video of Russian air cadets dancing in their underwear has spurred other people to film similar clips, with millions of views and hundreds of thousands of shares on social media.

The craze has been dubbed the 'Satisfaction Challenge' as the videos, like those of the original cadets, all feature people dancing along - in various degrees of undress - to dance hit Satisfaction by Benny Benassi.

Russia's Air Transport Agency had at first condemned the behaviour of the cadets, who were threatened with expulsion from Ulyanovsk Institute of Civil Aviation, but the authorities softened their stance after thousands defended the young men online and posted their own videos