Germany's next big battle?

If you thought the Greek or Spanish crises were bad enough in the eurozone, imagine this: a eurozone split so fundamentally in the future that Germany and France end up on different sides - and a dispute about saving the single currency that leads to rows about, say, whether France can keep nuclear weapons.

It is a scenario European leaders would, in public at least, reject as ludicrous. The partnership between France and Germany has been at Europe's heart. Preventing conflict between the two countries was why European integration began after World War II.