If a week is a long time in politics, after a bruising fortnight of wrestling with the world’s two superpowers, the European Union could be forgiven for thinking it has aged several decades.A bruising encounter over Russia with China’s top diplomat Wang Yi was followed by chaotic skirmishes on trade with the United States over the last week, as the EU scrambled to avoid being crushed between the duelling titans.The bad news for the bloc’s bureaucrats is that they may have an even trickier few...