The Northern Ireland Question is the most intractable and potentially harmful issue in Britain's relations with the EU in the post-Brexit era.Although the Northern Ireland Protocol signed by the UK and the EU avoids the establishment of a hard border on the island of Ireland,it hit the economy of Northern Ireland,hindered free trade flows within the UK,alienated unionists in Northern Ireland,encouraged street violence in Northern Ireland,and reduced trust between the UK and the EU.The new Windsor Framework Agreement between the UK and the EU provides a simple solution to the Northern Ireland issue,which straddles trade and politics.It fulfills the promise of the UK's exit from the EU,consolifies the hard-won political gains of the past 25 years in Northern Ireland,and lays the foundation for a sustainable future for Northern Ireland and the UK as a whole.At the same time,the new agreement has a very positive significance for improving UK-EU relations,strengthening UK-France cooperation,and repairing UK-US relations.