Defending European strategic interests must be a priority to level the economic playing field in an increasingly volatile worldGiven the daunting nature of the challenges they face in the era of Donald Trump, it is perhaps understandable that European politicians should wish to get away from it all. This week, in what is being billed as a “leaders’ retreat”, a remote castle in the Belgian countryside has been selected for an EU summit on competitiveness. The pastoral setting may soothe the spirits of attending heads of state; but it belies the urgency of the debate they need to have.Europe in the postwar period has never felt so insecure. Mr Trump’s America First administration has made clear its intention to bully the continent economically through tariffs and threats, and the transatlantic alliance can no longer be relied upon for its defence. Hi-tech competition from China threatens to overwhelm European industry’s attempts to keep up in key areas, such as the green transition. Acro...