A four-week conference at the United Nations headquarters concluded Friday without reaching an agreement on reviewing the Nuclear Nonproliferation Treaty, marking a diplomatic setback for global nuclear disarmament efforts.

The conference, which brings together signatory nations every five years to assess the treaty's implementation, ended in deadlock as the United States and Iran engaged in disputes over Iran's nuclear program. The treaty, which came into force in 1970, aims to prevent the spread of nuclear weapons while promoting peaceful uses of nuclear energy.

Delegates had spent nearly a month negotiating various aspects of nuclear nonproliferation, disarmament, and the peaceful use of nuclear technology. The failure to reach consensus reflects broader tensions in international relations and disagreements over how to address nuclear proliferation concerns.

Separately, diplomatic activity continued at the UN regarding other regional security issues, with France preparing a resolution related to the Strait of Hormuz while voting on a US-sponsored text remained stalled. The Strait of Hormuz serves as a critical shipping lane for global oil supplies.

The lack of agreement at the nonproliferation conference underscores ongoing challenges in multilateral diplomacy on nuclear issues, particularly as tensions between major powers have intensified in recent years. The next review conference is scheduled for 2027.