The total number of nuclear warheads fell worldwide, but the amount of operational nuclear weapons started to rise.
Humanitarian leaders say the risk of nuclear catastrophe is the highest 'since the worst moments of the Cold War.'
The number of nuclear warheads that are available to nations for deployment reached 9,576 at the start of 2023, up from 9,440 a year earlier, according to a watchdog's new report.
The leaders had contradictory accounts of why there was no agreement on dismantling North Korea's nuclear weapons.
The U.S. will suspend participation in the Intermediate Range Nuclear Forces Treaty against nuclear-capable cruise missiles.
Arms control experts urged the Trump administration to reverse plans to withdraw the United States from the 1987 Intermediate-Range Nuclear Forces Treaty with Russia.
The Trump administration announced plans to withdraw the United States from the INF Treaty of 1987, and blamed Russia.
The U.N. secretary-general launched a campaign underscoring the need for nations to scrap nuclear arsenals and other weapons that could result in catastrophic mistakes.