Iraqi sovereignty was interrupted by the multinational forces which overthrew Saddam Hussein in the 2003 invasion of Iraq.
On 8 June 2004, the United Nations Security Council resolution 1546 was adopted unanimously, calling for "the end of the occupation and the assumption of full responsibility and authority by a fully sovereign and independent Interim Government of Iraq by 30 June 2004."
The transfer of sovereignty actually took place a day or two ahead of schedule. Though resulting in the legal return of sovereignty to an Iraqi-led governing force and technically ending the occupation, practical responsibilities continue to be handed over by the multinational force in Iraq.