The 2003 invasion of Iraq by the United States, United Kingdom, Australia, Poland and a coalition of other countries was a violation of the United Nations Charter, the bedrock of international relations in the post-World War II world. The then United Nations Secretary-General Kofi Annan stated in September 2004 that: "I have indicated it was not in conformity with the UN charter. From our point of view and the UN Charter point of view, it [the war] was illegal".