Russian billionaire backing Sochi Winter Olympics

Thursday 7 February marks one year until the 2014 Winter Olympics open in Sochi in southern Russia.

The organising committee says construction is on schedule - but the cost has increased to $50 billion (37 billion euros), making it more expensive than the summer Olympics in Beijing, and three times the cost of the London games last year.

The BBC's Moscow Correspondent Daniel Sandford spoke to Vladimir Potanin, one of the Russian oligarchs who has paid some of the bill - in Rosa Khutor, the ski resort that he has built from scratch 40 kilometres outside Sochi.