BRUSSELS — Sweden’s Prime Minister Ulf Kristersson is looking forward to meeting his fellow leaders at a castle in the Belgian countryside on Thursday but not even these relaxed surroundings can quell the EU's simmering divisions. The chief agitator this time is French President Emmanuel Macron, who is pushing for a new “Buy European” drive — which would seek to favor the EU’s own companies in areas of strategic importance such as defense, steel and electric vehicles. Macron has triggered