"These developments flagrantly disregard the lessons the international community should have learned from the tragedies of history," he said. Russia and the United States—which is arming Ukraine and Israel—have the largest nuclear arsenals. The other nuclear-armed nations are China, France, India, Israel, North Korea, Pakistan, and the United Kingdom.
"Despite the current turmoil at the nation-state level, we, the people, must never give up," Matsui added. "Instead, we must work even harder to build civil society consensus that nuclear weapons must be abolished for a genuinely peaceful world."
The mayor also urged the Japanese government to respect the wishes of hibakusha, or survivors, and join the United Nations Treaty on the Prohibition of Nuclear Weapons (TPNW), which was adopted in 2017 and took effect in 2021.
"The treaty not only bans nuclear weapons and all activities related to their production, deployment, and use, but also mandates that countries that joined the treaty provide support for people harmed by nuclear weapons in the past and for the cleanup of areas that were used for nuclear testing," survivor Terumi Tanaka noted Wednesday in a New York Times opinion piece.
Tanaka was 13 years old at the time of the bombing—an experience he recounted last year, while accepting the Nobel Peace Prize on behalf of a group he co-chairs: Nihon Hidankyo, also known as the Japan Confederation of A- and H-Bomb Sufferers.
"Our Nobel Peace Prize sends a message to younger people that they need to be aware that we are facing an emergency—and the need to see a larger movement of young activists working to address the nuclear threat," 93-year-old Tanaka wrote Wednesday. "Even here in Japan, not enough people see this as a pressing issue."
The International Campaign to Abolish Nuclear Weapons (ICAN)—which won the Nobel Peace Prize after playing a significant role in building support for the TPNW in 2017—also used the anniversary to advocate for abolishing nuclear weapons.
ICAN executive Melissa Parke, who joined the ceremony in Japan, said in a statement that "it is not possible to come to Hiroshima and attend these solemn commemorations without being moved as well as convinced of the urgent need for nuclear weapons to be eliminated."
"The hibakusha, who were awarded last year's Nobel Peace Prize for their tenacious campaigning for the elimination of nuclear weapons, deserve to see their work vindicated and to witness the end of these inhumane, indiscriminate weapons of total destruction in their lifetime," Parke argued. "That means the nine nuclear-armed countries, most of which were represented here today, must heed their call to join the U.N. Treaty on the Prohibition of Nuclear Weapons and get rid of their arsenals."
In a Common Dreams opinion piece about the youth impacted by the 1945 bombings, ICAN treaty coordinator Tim Wright wrote: "The fact that children would suffer the greatest harm of all in the event of a nuclear attack against a city today should have profound implications for policymaking in nuclear-armed states and spur action for disarmament. Yet, all nine such states continue to act contrary to that objective. And the risk of a nuclear weapon being used again appears to be at an all-time high."
Common Dreams also published related opinions from Gerry Condon, a Vietnam-era veteran and former president of Veterans for Peace; Austin Headrick, public education and advocacy coordinator for Asia at American Friends Service Committee; and Ann Wright, a U.S. Army veteran who resigned from the U.S. State Department in opposition to the 2003 invasion of Iraq.
Speaking at the ongoing 2025 World Conference Against Atomic and Hydrogen Bombs, Wright noted that "there are a multitude of organizations in the United States and around the world that are working for the elimination of nuclear weapons."
"As we commemorate the lives lost and damaged by nuclear weapons 80 years ago," she said, "we commit ourselves to work harder for the elimination of these weapons, taking on our governments and the industries that make money from the construction and testing of these weapons of mass destruction."
ICAN in June released a report showing that the world's nine nuclear-armed nations spent more than $100 billion on their arsenals last year, up 11% from 2023. A few days later, the Stockholm International Peace Research Institute's annual yearbook warned that "a dangerous new nuclear arms race is emerging at a time when arms control regimes are severely weakened."
Those reports followed similar warnings from the experts behind the Doomsday Clock, who in January set the symbol of how close the world is to apocalypse at "89 seconds to midnight—the closest it has ever been to catastrophe."
Fueling fears of such a catastrophe, U.S. President Donald Trump said last Friday that he "ordered two Nuclear Submarines to be positioned in the appropriate regions" in response to "highly provocative statements" by former Russian President Dmitry Medvedev, who is now the deputy chairman of Russia's Security Council.
During Trump's first term, he withdrew the United States from the 1987 Intermediate-range Nuclear Forces Treaty with Russia—after which the Kremlin declared a self-imposed moratorium on the deployment of those missiles. The Russian Foreign Ministry announced Monday that it will no longer abide by its rules, citing recent moves by the U.S. and its allies.
