The 2010 Review Conference of the Parties to the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) is opening in the United Nations Headquarters in New York on Monday as disputes continue on Iran's nuclear program.

The United States and other Western countries suspect Iran of developing nuclear weapons under the guise of a civilian nuclear energy program and are seeking new sanctions following Iran's move to enrich uranium to 20%. This is likely to be one of the main focuses of the conference.

The Iran Six (France, Britain, Germany, the United States, Russia and China) began on April 19 discussing the text of a draft resolution imposing sanctions on Iran over its controversial nuclear program.

Iranian President Mahmoud Ahmadinejad and U.S. State Secretary Hillary Clinton will be the key figures on the agenda of the conference's first day.

Russian Deputy Foreign Minister Sergei Ryabkov is to address the forum on Tuesday.