BRUSSELS — The European Commission is set to impose tougher penalties on countries obstructing trade across the EU, according to a draft document seen by POLITICO.  President Ursula von der Leyen wants to revamp the three-decade-old single market to boost the bloc’s competitiveness vis-à-vis China and the U.S., drawing on the recommendations of former Italian Prime Minister Mario Draghi, who has warned that the EU faces a “ slow agony of decline ” if it fails to take decisive action.  The