BRUSSELS (Reuters) - European Union leaders will tell Britain next week it must improve the terms of its withdrawal offer, but give London the prospect of a rapid move to free-trade talks in December if that happens, their draft joint statement showed. The remaining 27 EU leaders will discuss Brexit without British Prime Minister Theresa May next week after a fifth round of technical negotiations ended in a deadlock earlier on Thursday. While the draft statement makes clear that no  sufficient progress  in divorce talks was made on safeguarding citizens  rights, the Irish border and Britain s exit bill, it also has the 27 states making a substantial gesture toward London. The draft, submitted to the 27 governments on Thursday, said the EU should launch immediate internal work on possible transitional arrangements after Brexit so that it can move to talks on future ties with Britain as soon as possible after  sufficient progress  is made on the three basic matters.   At its next session in December, the European Council will reassess the state of progress in the negotiations with a view to determining whether sufficient progress has been achieved,  said the draft, seen by Reuters. Should that happen, it said the EU 27 would prepare the necessary official documents on  the framework for the future relationship and on possible transitional arrangements which are in the interest of the Union.   In order to be fully ready for such a scenario,  it said, EU leaders task their Brexit negotiator Michel Barnier  to start internal preparatory discussions.  