On January 6, Libya ratifies the Comprehensive Nuclear Test-Ban Treaty.

On February 2, Pakistani nuclear scientist, Abdul Qadeer Khan acknowledges that he provided Iran, Libya, and North Korea with the necessary designs and technology to fabricate uranium enrichment equipment.

On March 10, Libya signs the Additional Protocol with the IAEA.

On April 28, the United Nations Security Council adopts Resolution 1540 on nonproliferation of weapons of mass destruction

The third session of the Preparatory Committee for the 2005 NPT Review Conference is held from April 26 to May 7 at UN Headquarters in New York. The PrepCom failed to submit a consensus report with substantive recommendations for the 2005 Review Conference.

On May 27, China joins the Nuclear Suppliers Group.

On June 18, the IAEA Board of Governors adopts a resolution calling on Iran to increase its cooperation with the IAEA.

In September, the United States removes most sanctions on Libya and resumes oil imports.

On September 30,the Iraqi Survey Group (ISG) releases a comprehensive report detailing its findings related to Iraq's weapons of mass destruction program.

On November 15, France, Germany and the United Kingdom announce an agreement in which Iran states its intention to continue suspension of enrichment and reprocessing activities, as well as reaffirms its commitment to the NPT.