Donald Trump is back. That’s the new reality the European Union faces since American voters went to the polls and granted the Republican a stronger-than-expected victory, sweeping the seven battleground states that were up for grabs. Trump’s return to the White House was not exactly an earth-shattering surprise for Brussels, as opinion polls had suggested an impossibly tight race where any outcome was possible. Still, the comeback of a man with such aversion to the multilateral system at a time when the world is beset by brutal wars makes officials and diplomats sweat. How should the EU naviga…