Ambassador Do Hung Viet, Permanent Representative of Viet Nam to the United Nations and President-designate of the 11th Review Conference (RevCon 11) of the Treaty on the Non-Proliferation of Nuclear Weapons (NPT), chaired regional group consultations with regional groups, member countries, and relevant international organisations based in Vienna, Austria, including the International Atomic Energy Agency (IAEA), from November 24-26.