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.