 The JNA campaign in Croatia ended in a stalemate, leading the belligerents to accept an internationally supervised ceasefire, formulated as the Vance plan—a result of a diplomatic mission by the Special Envoy of the Secretary-General of the United Nations Cyrus Vance, aided by United States diplomat Herbert Okun, and Under-Secretary-General of the United Nations for Special Political Affairs Marrack Goulding, to Yugoslavia aimed at securing a negotiated end to hostilities in Croatia.The plan proposed a ceasefire, the protection of civilians in specific areas designated as UN Protected Areas and deployment of a UN force to Croatia.The Vance plan provided for the end of the Croatian blockade of the JNA barracks, the withdrawal of all JNA personnel and equipment from Croatia, the implementation of a ceasefire and the facilitation of delivery of humanitarian aid.