Byline: Charles Bremner

With his tough line before the G20 summit, Nicolas Sarkozy is playing world statesman, the only act that has served him well at home since his popularity dived soon after his election in 2007.

About 38 per cent of the public approve of Mr Sarkozy's performance as President, but when pollsters ask how he represents France abroad, he scores up to 70 per cent. "Super-Sarko" is admired for the vigour with which he charges around world capitals, and especially for what was seen as his deft handling of his six months in the EU rotating presidency last year. He was given credit for persuading President Bush to stage the first G20 summit in Washington last November and he is claiming the paternity of its follow-up this week in London.

By casting...