In November 2002, the United Nations Security Council adopted Resolution 1441, giving Iraq an ultimatum to co-operate in disarmament within an unstated timeframe of a few months. However, in March 2003, the U.S., supported by fifty countries (including the United Kingdom, Spain, Australia, the Czech Republic, Denmark, the Netherlands and Poland) which the Bush administration referred to as the "coalition of the willing" launched military operations against Iraq. On April 9, Saddam Hussein's regime was overthrown and Iraq was placed under occupation, marked by the fall of Baghdad. The U.S. argued that this action was authorized by Resolution 1441, since Iraq had failed to comply by co-operating fully in the identification and destruction of its weapons programs, and since Resolution 1441 promised 'serious consequences' for lack of full compliance and achievement of its objective.