gothenburg sweden deadlock divorce talk britain european union eu summit chair donald tusk say friday add cautious optimistic negotiations could move next phase december eu want main elements divorce agreement britain financial settlement citizen right lack physical border northern ireland ireland move talk future trade agreement key british-based businesses far progress three areas insufficient raise prospect divorce talk drag next year without start discussions future relationship company need make strategic business decisions deadlock tusk tell reporters sideline eu leaders meet swedish city gothenburg also hold talk british prime minister theresa may feel much good safe meet theresa may everything possible tusk say visibly goodwill side still chance achieve first goal achieve finalization first phase negotiations cautious optimistic say meet may next friday nov. 24 consult progress another eu meet brussels eu 's tusk deadlock brexit cautious optimistic