Arbitration Commission of the Peace Conference on Yugoslavia
On 20 November 1991 Lord Carrington asked: "Can the internal boundaries between Croatia and Serbia and between Bosnia and Herzegovina and Serbia be regarded as frontiers in terms of public international law?" Applying the principle of "uti possidetis juris", the commission concluded on 11 January 1992, "The boundaries between Croatia and Serbia, between Bosnia and Herzegovina and Serbia, and possibly other adjacent independent states may not be altered except by agreement freely arrived at... Except where otherwise agreed, the former boundaries become frontiers protected by international law".
Croatian War of Independence
International peacemaking efforts continued, and a new peace plan called the Z-4 plan was presented to Croatian and Krajina authorities. There was no initial Croatian response, and the Serbs flatly refused the proposal. As the deadline for UNPROFOR to pull out neared, a new UN peacekeeping mission was proposed with an increased mandate to patrol Croatia's internationally recognized borders. Initially the Serbs opposed the move, and tanks were moved from Serbia into eastern Croatia. A settlement was finally reached, and the new UN peacekeeping mission was approved by United Nations Security Council Resolution 981 on March 31. The name of the mission was the subject of a last-minute dispute, as Croatian Foreign Minister Mate Granić insisted that the word "Croatia" be added to the force's name. The name United Nations Confidence Restoration Operation in Croatia (UNCRO) was approved.