Next week, Donald Trump will take up residence in the White House once again. A few months from now, the world’s most powerful man may have undone some of the major progress made by a world order based on rules that have been developed since 1945 and which underpin the European Union.
The multilateral system will have to take whatever the 47th American president throws at it. The current paralysis of the UN, a permanent member of the Security Council of which has been engaged in military...