So has anything changed?
Yes, and no.
The statement issued by the UK and the EU (known officially as a joint interpretive instrument) gives added legal reassurance that both sides intend that the backstop plan for the Irish border, if it ever needs to be used, would be only a temporary measure.
But the EU has said this before – notably in a letter sent to Theresa May in January by the President of the European Commission Jean Claude Juncker and the President of the European Council Donald Tusk.
On 14 January, Mrs May said the attorney general had confirmed