In Rome on Saturday 25 March, the European leaders, minus their British counterpart, Theresa May, will adopt the Declaration of Rome, which will stress the required “unity” of the Twenty-Seven to move forward the European project "in the same direction", whilst highlighting the option for countries to create vanguards in certain areas if they wish to integrate more quickly.
The day before, the Polish and Greek leaders announced that they would agree to sign the declaration put before...