Denmark and four other European Union countries agreed on Friday on a model for “return hubs” in non-EU nations and hope to begin sending migrants to the facilities as early as 2027, an official said. The announcement, made after a one-day meeting in Copenhagen, is the latest development in an effort by EU states to send people whose asylum requests have been rejected to third countries outside the bloc. “We are moving forward towards what is actually a fundamental transformation of the common...