Disagreement between nuclear and non-nuclear countries has prevented the meeting of the Treaty on the Non-Proliferation of Nuclear Weapons, or NPT, from adopting a consensus document.
About 190 member states took part in the preparatory session for the 2020 review conference of the treaty which was held over two weeks at UN headquarters in New York. It ended on Friday.
The UN holds a review conference every five years.
The United States and Russia engaged in mutual criticisms and nuclear and non-nuclear states remained split on how the disarmament process should advance.
Ambassador Rafael Grossi of Argentina, who is president-designate of the 2020 meeting, acknowledged the differences among the members.