British Prime Minister Theresa May urged EU leaders today to urgently set out plans to move forward with Brexit negotiations as they prepared to delay key trade talks until at least December.<br/><br/>Arriving for the two-day summit, May accepted that her 27 European Union counterparts were unlikely to agree that there has been enough progress on divorce issues to move on to a second phase, saying the meeting was intended to "take stock".<br/>'<br/>But she urged them to start preparations to discuss trade and a transition deal at the next summit in December. <br/><br/>She also published an open letter to the three million EU citizens living in Britain today promising they would not be asked to leave after Brexit in March 2019. EU President Donald Tusk warned he did "not expect any kind of breakthrough.