The preparatory committee for the 2026 review conference of the Treaty on the Non-Proliferation of Nuclear Weapons has failed to adopt a summary document, due to opposition by Russia, China and Iran.

The gathering, which opened on July 31 in the Austrian capital of Vienna, ended on Friday.

On the final day, NPT committee chair Jarmo Viinanen presented a draft summary of the session.

The draft says states parties reaffirmed the importance of the NPT's role in pursuing nuclear disarmament and non-proliferation.

The draft says the parties condemned threats of the use of nuclear weapons, in an apparent reference to Russia's threats during its invasion of Ukraine. It also says they expressed concerns about the safety of Ukraine's Zaporizhzhia nuclear power plant, which is occupied by Russian forces.

The document also mentions that states parties strongly supported the efforts of the International Atomic Energy Agency to review Japan's plan to release treated and diluted water from the Fukushima Daiichi nuclear power plant into the ocean.

But the document was not adopted as Russia, China and Iran strongly opposed making it an official record.

Throughout the session, a number of representatives criticized Russia for repeatedly threatening to use nuclear weapons.

The Russian delegate countered that Western countries posed a security threat.

At the closing of the meeting, Viinanen expressed a sense of crisis. He said if an agreement is not reached at the next review conference, the credibility of the NPT could be shaken.