The new president of the United States, Joe Biden, announced yesterday the return of his country to "diplomacy", a new step to undo the legacy of Trumpism in the international arena, which was marked by a mixture of nationalist isolationism and unilateralism. In fact, Biden himself already anticipated Washington's return to multilateralism by signing the return to the Paris Agreement against the climate crisis and to bodies such as the World Health Organization. Now, however, comes the moment of truth, and it is when the new administration has to redefine its position, for example in the Middle East and in the relations it wants to establish with the European Union (with whom Trump has maintained a distant and problematic relationship), Russia and China.