Requests the Secretary-General to establish a monitoring mechanism composed of up to five experts, for a period of six months from its effective entry into operation, to collect additional relevant information and investigate relevant leads relating to any allegations of violations of the measures contained in resolutions 864 (1993), 1127 (1997) and 1173 (1998), including any relevant leads initiated by the Panel of Experts, including through visits to relevant countries, and to report periodically to the Committee, including providing a written report by 18 October 2000, with a view to improving the implementation of the measures imposed against UNITA, and further requests the Secretary-General, within 30 days of adoption of this resolution and acting in consultation with the Committee, to appoint experts to serve on the monitoring mechanism;