Ending the series of unsuccessful ceasefires, the UN deployed a protection force in Serbian-held Croatia—the United Nations Protection Force (UNPROFOR)—to supervise and maintain the agreement. The UNPROFOR was officially created by UN Security Council Resolution 743 on February 21, 1992. The warring parties mostly moved to entrenched positions, and the JNA soon retreated from Croatia into Bosnia and Herzegovina, where a new conflict was anticipated. Croatia became a member of the UN on May 22, 1992, which was conditional upon Croatia amending its constitution to protect the human rights of minority groups and dissidents.