It was not without sadness that the president of the European Council, Donald Tusk, received the United Kingdom’s letter at midday on Wednesday, notifying the EU under Article 50 of the Treaty of the EU that it will be leaving the European Union.
Tusk said there was no reason to pretend that this was a happy day in Brussels or London but there was something positive all the same. He said that paradoxically, Brexit had made the EU more determined and united than before and he was...