It’s probably fair to say that most European leaders greeted Joe Biden’s defeat of Donald Trump in last November’s presidential elections with a huge sigh of relief. After four years of isolationism, bombast and unpredictability, Biden’s presidency, if nothing else, heralds a return to government by professionals, and an end of diplomacy by Twitter-rant. Much of Biden’s early months in office will likely be spent unpicking and reversing some of Trump’s most isolationist moves. The US will resume its membership of the World Health Organisation and the Paris Climate Accord. Yet it would be a mistake to invest too much significance in the transatlantic relationship, and how much will change over the coming four years.