Decides to extend the mandate of the United Nations Mission in Bosnia and Herzegovina, which includes the IPTF, for an additional period terminating on 21 June 1998, which will be renewed for a further period unless there are significant changes to the security arrangements as currently provided by the multinational stabilization force (SFOR), and decides also that the IPTF shall continue to be entrusted with the tasks set out in Annex 11 of the Peace Agreement, including the tasks referred to in the conclusions of the Peace Implementation Conference held in London on 4 and 5 December 1996 (S/1996/1012, annex) and of the Sintra and Bonn meetings and as agreed by the authorities in Bosnia and Herzegovina;