In the first of a series of five articles on Europe Stephen Mulvey looks at the long-term prospects for EU enlargement. The European Union has taken off and is flying east without a clear idea of where or when it is going to land. It is rapidly approaching the borderlands of the old USSR, where it will touch down next year to refuel. It will then glide into the Balkans in 2007, and in theory it could land in Turkey 10 years from now, giving "Europe" a border with Iraq. But that might not be the limit. Belarus, Moldova and...