Divorced UK and EU head for new Brexit fight over N Ireland

In this Saturday, Dec. 19, 2020 file photo, Britain's chief negotiator David Frost arrives at the UK delegation office for Brexit talks in Brussels. It was late on Christmas Eve last year when the European Union and Britain finally clinched a Brexit trade deal after years of wrangling, threats and missed deadlines to seal their divorce.There was hope that now-separated Britain and the 27-nation bloc would sail their relationship toward calmer waters. Don't even think about it. Such was the bile and bad blood stirred up by the diplomatic brinkmanship and bitter divorce that, two months from an…