18. As the conflict continued, however, the Council in its resolution 757 (1992) of 30 May 1992, determined that the situation in Bosnia and, Herzegovina and in other parts of the former Socialist Federal Republic of Yugoslavia constituted a threat to international peace and security, and acting under Chapter VII of the Charter, imposed comprehensive mandatory economic sanctions against the Federal Republic of Yugoslavia (Serbia and Montenegro). It also demanded that "all parties and others concerned create immediately the necessary conditions for unimpeded delivery of humanitarian supplies to Sarajevo and other destinations in Bosnia and Herzegovina, including the establishment of a security  zone encompassing Sarajevo and its airport ...". The Council requested that I continue to use my good offices in order to achieve these objectives and invited me to keep under continuous review any further measures that could become necessary to ensure unimpeded delivery of humanitarian supplies.

B. Good offices, liaison and negotiation

19. Shortly thereafter, the Security Council began to request the Secretary-General and UNPROFOR to use their good offices to assist the

parties to end the fighting and settle their differences by peaceful means. Such requests have since been repeated at frequent intervals (see, for instance, resolution 758 (1992), para. 9, resolution 764 (1992), para. 9, resolution 908 (1994), para. 13, resolution 959 (1994), paras. 5 and 6, etc.).

20. This task has throughout been a priority for UNPROFOR and has accounted for much of the time of my Special Representative and his senior staff Considerable successes have been achieved, beginning with the Sarajevo airport agreement of 5 June 1992. Unfortunately, UNPROFOR has had less success in subsequently persuading the parties to honour their commitments, as will be evident from the following subsections of the present report. This task will nevertheless continue to be one of the most important entrusted to a continuing United Nations peace-keeping operation in Bosnia and Herzegovina.

C. Sarajevo airport

21. Following the agreement on the reopening of Sarajevo airport, the Council approved, in its resolution 758 (1992), my recommendation to deploy UNPROFOR at the airport, with no reference to Chapter VII of the Charter. Resolution 761(1992), which authorized the actual deployment, again made no reference to Chapter VII. However, the Council demanded that all parties and others concerned cooperate fully with UNPROFOR and international humanitarian agencies and organizations and take all necessary steps to ensure the safety of their personnel. In the absence of such cooperation, the Council did not exclude the possibility of taking other measures to deliver humanitarian assistance to Sarajevo and its surrounding areas. The deployment of UNPROFOR to Sarajevo airport was, therefore, based on an agreement and conducted under normal peace-keeping rules and procedures.

22. It will be recalled from paragraph 18 of document S/1994/300 that UNPROFOR's mandate related to Sarajevo airport was:

(a) To ensure the immediate security of the airport and its installations,

(b) To supervise the operation of the airport and control its facilities and organization, including local civilian personnel,

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