British Prime Minister Theresa May’s renewed pledge to deliver Brexit without dividing the UK was met with contradictory ultimatums Friday from Northern Ireland’s unionist and nationalist parties. May returned from a bruising EU summit in Salzburg to deliver an impassioned televised address in which she blamed Brussels for the impasse and demanded “respect” for the UK. “It is something I will never agree to — indeed, in my judgement it is something no British prime minister would ever agree to,” she said.