Gulf Cooperation Council is an organization of Arab states that work together in such matters as military defense and economic policy. Its six members are Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, and the United Arab Emirates. The council formed in 1981. In 1990, it condemned Iraq’s invasion of Kuwait and demanded complete, unconditional withdrawal of Iraqi troops from Kuwait. Member countries of the council sided with the United States and its allies in the 1991 Persian Gulf War, in which Iraq was defeated. The member countries adopted unified tariffs in 2003.