After eight years , war-weariness , economic problems , decreased morale , repeated Iranian military failures , recent Iraqi successes , Iraqi use of weapons of mass destruction , lack of international sympathy , and increased U.S.–Iran military tension all led to Causation a ceasefire Process_end brokered by the United Nations .

Allied efforts were hampered Hindering by divided objectives , war-weariness from the overall global conflict Hostile_encounter , and a lack of domestic support Supporting .