 It was determined to monitor compliance with the arms embargo, and, noting that relevant parties had not complied with Security Council demands, extended the arms embargo until 31 July 2005.The provisions of the embargo would be altered depending on compliance with the demands of the Council, in a review of the measures by 1 October 2004 and periodically thereafter.The resolution instructed the Secretary-General Kofi Annan to re-establish a group of experts for a period until 31 January 2005, which would be required to report on the implementation of the arms embargo and to make recommendations.