British Prime Minister Rishi Sunak has reached a new deal on post-Brexit trade rules for Northern Ireland, which requires the region to follow some EU rules while still remaining part of the UK. The agreement has been welcomed by the EU and the UK government, and is seen as a major breakthrough in the UK's post-Brexit relationship with the EU. Sunak now faces the challenge of selling the deal to his own party, while also ensuring it is accepted by the EU.