BERLIN: France and Germany's governments kick off an unprecedented two-day retreat in Hamburg on Monday in a bid to re-set relations between the European Union's two biggest powers amid a host of disagreements on energy, industry and defence policy. The French-German motor that has driven EU policy for decades has proven rusty of late although it is more necessary than ever given the multitude of crises the bloc faces, say analysts and lawmakers. Europe is grappling with surging irregular migration, the transition to a carbon neutral economy, the...