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We appeal to you, Your Holiness Pope Leo XIV, as the leader who has made the greatest effort to speak for humanity as a whole, instead of for specific nations, religions, or constituencies, to call for an emergency international summit to guide the world away from the current path of war and potential nuclear disaster and to peacefully resolve the greatest crises facing humanity today. Such an effort would be consistent with your repeated calls for peace and justice ever since you assumed the papacy—calls that have inspired and given hope to millions if not billions of people across our planet.
On June 10, 2025, then U.S. Director of National Intelligence (DNI) Tulsi Gabbard released a brief but chilling video that began in Hiroshima and warned we are “closer to the brink of nuclear annihilation than ever before” and that “political elite warmongers are carelessly fomenting fear and tensions between nuclear powers.” “It’s up to us, the people,” she concluded, “to speak up and demand an end to this madness. We must reject this path to nuclear war and work toward a world where no one has to live in fear of a nuclear holocaust.”
On October 20, 2025, Sergei Naryshkin, the head of Russia’s SVR foreign intelligence agency, warned, “The world is now experiencing the most fragile moment for international security since World War II.” Naryshkin continued, “Our shared, and perhaps principal, task is to ensure that adaptation to the new reality proceeds without a major war, as has happened at previous historical stages.” It has been many months since the two intelligence chiefs rang the alarm and we’ve only gotten closer to nuclear annihilation—much closer.
When Gabbard and Naryshkin issued those warnings, the war in Ukraine was raging, Israel was conducting its genocide in Gaza, and tensions were high between China and the U.S. over Taiwan and the South China Sea. We have since added the U.S./Israeli war with Iran. The threat of WWIII has thus grown exponentially.
Signs continue to appear that leaders are planning for such an eventuality, even though we have known for more than four decades that even a limited nuclear war, let alone a large-scale one, could unleash unthinkable damage globally, including nuclear winter, which would threaten to end life on our planet. On August 20, 2024, the New York Times ran a front-page article warning that the U.S. was preparing to fight a simultaneous three-front nuclear war against Russia, China, and North Korea. That same day, the Bulletin of the Atomic Scientists reported on a growing school of nuclear strategists who believe a nuclear war can be fought and won, effectively overturning decades of understanding that a nuclear war cannot be won and must never be fought. Last year, U.S. Admiral Thomas Buchanan said that the U.S. was preparing to fight and win a nuclear war and keep enough nuclear weapons in reserve to be able to maintain its global hegemony. More recently, the U.S. Pentagon policy chief Elbridge Colby has discussed the need for the U.S. to use tactical nuclear weapons on top of deploying troops from South Korea and Japan if fighting breaks out between the U.S. and China over the Taiwan Strait.
The experts behind the Bulletin of the Atomic Scientists’ Doomsday Clock are not alone in believing that the world is getting closer and closer to nuclear annihilation. And on top of the threats coming from the U.S., several influential Russian leaders have called on Vladimir Putin to use nuclear weapons to defeat Ukraine.
We, the undersigned from around the world, think the timing is propitious for calling an emergency international summit to address major conflicts in the world and the need for stepping away from the nuclear precipice. Russia has been bogged down in Ukraine for almost five years. Though Russia continues to make incremental gains at great cost, the battlefield has largely stalled and both sides are causing extensive damage to energy infrastructure and shipping in their drone and missile warfare, causing global energy and food shortages and suffering both inside and outside their respective countries. If NATO-backed Ukraine continues to cross Russia’s red lines, will Putin be willing and able to thwart Russia’s hawks? The U.S, meanwhile, has been unable to find a diplomatic escape route from its war with Iran, which shows no sign of allowing the U.S. to end the crisis it and Israel created by attacking Iran. While China insists that retaining Taiwan is its ultimate red line, everyone in the region would benefit from a calming of tension and diverting resources into development, along the lines of China’s Belt and Road initiative, instead of into warmaking.
That last point should be applied universally. It is painfully wasteful to see so many nations diverting resources from food, housing, education, and healthcare to their militaries. This has especially been true in North America, Europe, and Asia, where talk of peacefully resolving conflicts has given way to talk of preparing for war. This wastefulness and irrationality are at their clearest when it comes to the spending of nine nuclear armed states to support, modernize, and increase their arsenals of nuclear weapons that could end human civilization in a matter of minutes. As the first state to sign and ratify the Treaty on the Prohibition of Nuclear Weapons (TPNW) in 2017, the Holy See under your leadership must remain true to the goals of this powerful effort of one hundred nations who have so far joined the treaty.
As you yourself wisely and powerfully stated a couple of months ago, “I have repeated more than once the fervent appeal that Saint Paul VI made to the United Nations Assembly--What unites me, my venerable predecessor noted, is a pact sealed ‘with an oath that ought to change the future history of the world: never again war, never again war! It is peace, peace, that has to guide the destiny of the nations of all mankind’! Above all in the atomic era, the affirmation of the truth must push through: it is not atomic weapons that generate peace, but disarmament. This truth, which seemed clear in past decades when we witnessed a nuclear de-escalation, has been obscured by a race to armament that today frightens and terrifies.”
It was indeed Pope Paul VI, the first pope to address the United Nations in October 1965, who, in that extraordinary address, quoted President Kennedy, “Mankind must put an end to war, or war will put an end to mankind.” He cited the Book of Isaiah, declaring, “They shall beat their swords into plowshares and their spears into pruning hooks.” In his 1967 Encyclical “Populorum Progressio,” Pope Paul VI emphasized, “Development is the new name for Peace.”
Other popes have also taken bold initiatives to save humanity in moments of crisis. In October 1962, Pope John XXIII appealed for peaceful resolution of the Cuban Missile Crisis and helped provide both President Kennedy and Premier Khrushchev with face-saving means to resolve the crisis diplomatically rather than militarily at a moment when war seemed imminent. A similar effort might succeed today when the world’s two major wars seem to be intractably bogged down. The same is true of the nuclear arms race as the nine nuclear powers are not only modernizing their arsenals but expanding them after decades of sensible if much too slow reductions. And, for the first time in decades, the two major nuclear antagonists are constrained by no nuclear arms control treaties. Other countries and territories, including Japan, South Korea, Poland, Saudi Arabia, Taiwan, and Ukraine, have begun discussing the attainment of nuclear weapons of their own, which would only turn the world into a larger nuclear tinderbox.
A papal appeal for an emergency summit to end the current wars and reverse the growing dependence on nuclear weapons and warfighting might give global leaders the chance to select a new course of action and get us off the current drive toward planet-destroying nuclear war. We urge you, Pope Leo, to use your unique moral authority to convene such a meeting of the world’s leaders, including the heads of state of the three principal nuclear powers, to meet and respond to the pleas of humanity to take our world in a fundamentally different direction before it is too late.
Initiating Signers
Peter Kuznick, Professor of History and Director of the Nuclear Studies Institute, American University
Jack Gilroy, Pax Christi, Veterans for Peace, Ban Killer Drones, International Peace Coalition of Schiller Institute
Ivana Nikolić Hughes, President, Nuclear Age Peace Foundation and Senior Lecturer in Chemistry, Columbia University
Richard Falk, Albert Milbank Professor Emeritus of International Law, Princeton University and Senior Vice President, Nuclear Age Peace Foundation
Naledi Pandor, former Minister of International Relations and Cooperation, South Africa (2019-2024)
H.E. Donald Ramotar, former President of Guyana, 2011-2015
Yukio Hatoyama, Former Prime Minister of Japan, 2009-2010
Ernesto Sócrates Pazmiño Granizzo, former Minister of Justice and Human Rights of Ecuador; former vice president of the Justice Studies Center of the Americas, Ecuador
Chandra Muzaffar, Islamic Reformist and Activist, President of the International Movement for a Just World (JUST); Convenor of SHAPE (Save Humanity and Planet Earth)
Hon. Douglas Roche, O.C., Canada
Gian Guido Folloni, former Italian Senator; former Italian Minister for Relations with Parliament; former editor of Italian weekly Il Sabato and editor-in-chief of Italian daily Avvenire; Vice President of the Italian Institute for Asia and President of the Italy-Libya Friendship and Cooperation Association, (Italy)
Kathy Kelly, Pax Christi Teacher of Peace 1998; Board President, World Beyond War
David Swanson, Executive Director of World Beyond War; author, “War is Still a Lie”
Marjorie Cohn, Professor Emerita, Thomas Jefferson School of Law; Dean, People’s Academy of International Law
Bandy X. Lee, President of the World Mental Health Coalition; Co-founder of Preventing Violence Now
Dr. James C. Cobey, Founder, Health Volunteers Overseas; Steering Committee, Voices from the Holy Land; Member, International Committee to Ban Landmines (ICBLM), which received the 1997 Nobel Peace Prize
Dr. Mohammad A. Toor, Chairman of Board of Trustees, Pakistani American Congress; President, American Pakistani Physicians for Justice & Democracy; Chairman, American Muslim Alliance
Glenn Diesen, Professor, University of South East Norway
Andrea Bartoli, President, Sant' Egidio Foundation for Peace and Dialogue; Founding Director, Center for International Conflict Resolution; Senior Research Scholar, Advanced Consortium on Cooperation, Conflict, and Complexity, Columbia University; former Dean , School of Diplomacy and International Relations, Seton Hall University; former Dean, Carter School for Peace and Conflict Resolution, George Mason University.
Ann Wright, US Army Colonel (Ret) and former US diplomat who resigned in March 2003 in opposition to the US war on Iraq. Member of Veterans for Peace, World Beyond War, CODEPINK and Hawaii Peace and Justice
Susan Schnall, President, Veterans for Peace
Norman Solomon, Author and National Director of Roots Action
Hon. Melissa Parke, Executive Director of the International Campaign to Abolish Nuclear Weapons (winner of the 2017 Nobel Peace Prize)
Margaret Power and Van Gosse, Co-Chairs, Historians for Peace and Democracy
Ray McGovern, Co-founder, Veteran Intelligence Professionals for Sanity
Martin Sheen, Golden Globe and Emmy Award-winning actor; Pax Christi Teacher of Peace (1999)
Setsuko Thurlow, Hiroshima atomic bomb survivor, Nobel Peace Prize Recipient, Order of Canada Recipient
Frida Stranne, Professor, John Morton Center for North American Studies, University of Turku, Finland
Gerry Condon, Co-Coordinator, Nuclear Abolition Working Group of Veterans for Peace; Board of Directors, Veterans for Peace; Chair, Golden Rule Committee
Lawrence B. Wilkerson, Colonel, U.S. Army (Retired), Former Chiel of Staff to the U.S. Secretary of State
Theodore Postol, Professor Emeritus of Science, Technology, and National Security Policy, Massachusetts Institute of Technology
Christina Spannar & Jan Oberg, founders, The Transnational Foundation for Peace and Future Research, TFF, Lund, Sweden - https://transnational.live
Dr. Helen Caldicott cofounder Physicians for Social Responsibility 1985 Nobel Peace Prize
Ambassador Akbar Ahmed, Distinguished Professor American University
Martin Sieff, Former Chief Political Correspondent, United Press International, Three time Pulitzer Prize Nominee
Hall Gardner, Professor Emeritus, Department of History and Politics, American University of Paris
Tadatoshi Akiba, Mayor of Hiroshima, 1999-2011; Former President of Mayors for Peace
Oliver Stone, Academy Award-winning Hollywood Director and Best-selling Author
Alice Slater, World Beyond War Board Member
Helga Zepp-LaRouche, Founder, Schiller Institute; Initiator, International Peace Coalition
Norma Field, Robert S. Ingersoll Distinguished Professor Emerita, University of Chicago
Rev. John Dear, Executive Director, The Beatitudes Center for the Nonviolent Jesus
John Kiriakou, former CIA Counterterrorism Officer; former Senior Investigator, U.S. Senate Committee on Foreign Relations
Dr. Herbert Reginbogin, Professor of International Relations and International Law, Institute for Policy Research, The Catholic University of America
Steven Leeper, Chairman, Peace Culture Village, Hiroshima; Board Member, Physicians for Social Responsibility; Past President and Chairman of the Hiroshima Peace Culture Foundation, 2007-2013
Hideki Yoshikawa, Director, Okinawa Environmental Justice Project; Advisory Board Member, World BEYOND War
Steve Rabson, Professor Emeritus, Brown University; Veteran, United States Army, Defense Atomic Support Agency
Corazon Valdez Fabros, Co-President, International Peace Bureau (1910 Nobel Peace Prize)
Anastasia Battle, International Peace Coalition co-initiator, Schiller Institute
April Brown, Co-Founder, Marshallese Educational Initiative, and Professor of History, NWACC
Mary Dickson, Author and Survivor of nuclear weapons testing
Steven Starr, Associate, Nuclear Age Peace Foundation
Liliana Gorini, Chairwoman of Movisol, Italy
Anthony Donovan, Veterans For Peace, Pax Christi International, Catholic Worker, War Resisters League
Marylia Kelley, Senior Advisor, Tri-Valley Communities Against a Radioactive Environment, Livermore, CA
Jean Stevens, Warheads to Windmills Coalition
Dr Aruna Kammila, Professor & Director, School of Legal Studies, REVA University, Bangalore, Karnataka, India
Alan Robock, Distinguished Professor, Rutgers University, and nuclear winter researcher
Aaron Good, political scientist, host of the American Exception podcast, author of 'American Exception: Empire and the Deep State'
Elliot Greenspan, Schiller Institute, International Peace Coalition (USA)
Roberto Vela Pinedo Presidente de la Red de Integracion Amazonica
Gen. Edwin de la Fuente Jeria, Former Commander-in-Chief of the Armed Forces of the Plurinational State of Bolivia
Maurizio Abbate, Chairman, National Institution for Cultural Activities of the Italian State (ENAM)
Rosemarie Pace, Pax Christi New York State
Jacques Cheminade, President, Solidarite et Progres (French political party); three times candidate for French President
Martha Hennessy, Catholic Worker, Kings Bay Plowshares 7, granddaughter of Dorothy Day
Robert Ellsberg, Publisher, Orbis Books
Marie Dennis, Past Co-President, Pax Christi International
Farhang Jahanpour, retired Distinguished Professor at the University of Isfahan, visiting professor at Harvard, lecturer at Cambridge, and part-time lecturer at Oxford University
Owen Brian Toon, Emeritus Professor, University of Colorado at Boulder, researcher of nuclear winter
Celeste Saenz, Mexico, head of Journalists Club
Henry Baldelomar, Bolivia, former ambassador to Washington, D.C.
Mempo Giardinelli, Argentina, recipient of the Romulo Gallegos literature award of Venezuela, and the National Literature prize of Mexico
Pedro Paez, Ecuador, former deputy economics minister in the Correa government
Fernando Garzon, Ecuador, for deputy interior minister in the Correa government, UN consultant, former President, Ecuadorian Committee for Solidarity with the Palestinian People
Ali Rastbeen, President of the Geopolitical Academy of Paris
Jane Swanson, President, San Luis Obispo Mothers for Peace
Bruce K. Gagnon, Global Network Against Weapons & Nuclear Power in Space
Tse Anye Kevin, Acting President, State 55 Afrika, Pan African Political Officer Global African Congress
Mossi Raz, former Member of the Israeli Knesset; former Director-General of Peace Now, Israel
Maoz Inon, Israeli peace activist; Co-CEO, InterAct; Co-Author, "The Future is Peace"
Muhammad Salim Akhtar, National Director, American Muslim Task Force on Civil Rights and Elections (AMT)
Ken Butigan, Member, Executive Committee of Pax Christi International's Catholic Nonviolence Initiative; Senior Lecturer in Peace, Justice and Conflict Studies, Catholic Studies Dept., DePaul University
Joan Carrero, President of the S'Oliver Foundation (Spain)
Beatriz Biccio, Professor, Federal University of Rio de Janeiro, historian and journalist (Brazil)
Professor (Dr) Anoop Swarup, Chairman Centre for Global Nonkilling
Ellen E Barfield, Veterans For Peace, War Resisters League, Women"s International League for Peace and Freedom
Rick Staggenborg, MD President, Veterans For Peace Linus Pauling Chapter
John Steinbach, Hiroshima Nagasaki Peace Committee of the National Capital Ares
Richard E. Rubenstein, University Professor Emeritus, Carter School for Peace and Conflict Resolution, Geroge Mason University
Joseph Carson, President, Affiliation of Christian Engineers
Ulf Sandmark, Chairman, Schiller Institute in Sweden
Mike Ferner, former national president, Veterans For Peace
Klaus Fimmen, vice chairman Buergerrechtsbewegung Solidaritaet (Civil Rights Movement Solidarity, Germany)
Art Laffin, Catholic Worker, Pax Christi Teacher of Peace 2016, author of The Risk of the Cross: Living Gospel Nonviolence in the Nuclear Age, co-editor of Swords into Plowshares
Tony Jenkins, Managing Director, International Institute on Peace Education, Coordinator, Global Campaign for Peace Education
Hno. Darwin Francisco Orozco Orozco, Minor Capuchin friar, novice master of the Conference of Capuchins of Hispanic America (CCH); member of the Franciscan Family’s Commission for Justice, Peace, and Integrity of Creation (JPIC), Santa Cruz, Bolivia
Ramón Emilio Concepción, Attorney at Law; Presidential Pre-candidate, PRM party (2020), Dominican Republic
Alcibíades Abreu, Professor, School of Mathematics of UNIBE and Catholic University of Santo Domingo, Dominican Republic
Rafael Reyes Jerez, Journalist; producer of the programs "Cara a Cara" and "Economía y Política," Dominican Republic
Enrique Antonio Sánchez Liranzo, Lawyer, author, poet—Columnist in Primicias newspaper, Dominican Republic
Dantes Ortiz Núñez, Historian; Professor of History, Autonomous University of Santo Domingo, Dominican Republic
Please sign me on.
Alice Slater
World. BEYOND War, Board Member
New signatures:
Christina Spannar & Jan Oberg, founders, The Transnational Foundation for Peace and Future Research, TFF, Lund, Sweden - https://transnational.live