We’re going to Davos – it’s going to be an interesting trip,” Donald Trump told reporters, just before boarding a delayed Air Force One flight to the annual World Economic Forum. Hours later, the US president was tearing into his European and Nato allies in a characteristically combative speech to world leaders and CEOs in Switzerland. He threatened France with tariffs over drug prices, said Denmark had fallen to Nazi Germany within six hours, and that without the US, everyone in the room would “all be speaking German... and a little Japanese perhaps”. Trump branded Canada’s leadership “ungrateful”, Europe “unrecognisable”...