Ukraine's President Volodymyr Zelenskiy and International Atomic Energy Agency (IAEA) Director General Rafael Grossi attend a joint news conference, as Russia's attack on Ukraine continues, in Kyiv, Ukraine April 26, 2022. REUTERS/Valentyn Ogirenko 

Ukraine's President Volodymyr Zelenskiy and International Atomic Energy Agency (IAEA) Director General Rafael Grossi attend a joint news conference, as Russia's attack on Ukraine continues, in Kyiv, Ukraine April 26, 2022. REUTERS/Valentyn Ogirenko 

A man reads a book at a train station, amid Russia's invasion of Ukraine, in Odesa, Ukraine, April 12, 2022. The book is titled: "Robert Oppenheimer and the atomic bomb". REUTERS/Igor Tkachenko 

The hands of Terumi Tanaka, a Nagasaki atomic bombing survivor and co-chairperson of Nihon Hidankyo, a country-wide organisation of atomic and hydrogen bomb sufferers, are pictured during his interview with Reuters at the Nihon Hidankyo office in Tokyo, Japan July 30, 2020. Picture taken July 30, 2020. REUTERS/Issei Kato 

cerumi Tanaka, a Nagasaki atomic bombing survivor and co-Chairperson of Nihon Hidankyo, a Japan-wide organisation of atomic and hydrogen bomb sufferers, shows a Nagasaki city map with circles indicating the distance from the hypocenter during an interview with Reuters at the Nihon Hidankyo office in Tokyo, Japan July 30, 2020. Picture taken July 30, 2020. REUTERS/Issei Kato 

Terumi Tanaka, a Nagasaki atomic bombing survivor and co-chairperson of Nihon Hidankyo, a country-wide organisation of atomic and hydrogen bomb sufferers, attends an interview with Reuters at the Nihon Hidankyo office in Tokyo, Japan July 30, 2020. Picture taken July 30, 2020. REUTERS/Issei Kato 

Terumi Tanaka, a Nagasaki atomic bombing survivor and co-chairperson of Nihon Hidankyo, a country-wide organisation of atomic and hydrogen bomb sufferers, poses for a photograph during an interview with Reuters at the Nihon Hidankyo office in Tokyo, Japan July 30, 2020. Picture taken July 30, 2020. REUTERS/Issei Kato 

Terumi Tanaka, a Nagasaki atomic bombing survivor and co-chairperson of Nihon Hidankyo, a country-wide organisation of atomic and hydrogen bomb sufferers, reacts during an interview with Reuters at the Nihon Hidankyo office in Tokyo, Japan July 30, 2020. Picture taken July 30, 2020. REUTERS/Issei Kato 

A badge of Nihon Hidankyo, a country-wide organisation of atomic and hydrogen bomb sufferers, is seen on the jacket of Terumi Tanaka, a Nagasaki atomic bombing survivor and co-chairperson of Nihon Hidankyo, during his interview with Reuters at the Nihon Hidankyo office in Tokyo, Japan July 30, 2020. Picture taken July 30, 2020. REUTERS/Issei Kato 

Terumi Tanaka, a Nagasaki atomic bombing survivor and co-chairperson of Nihon Hidankyo, a country-wide organisation of atomic and hydrogen bomb sufferers, attends an interview with Reuters at the Nihon Hidankyo office in Tokyo, Japan July 30, 2020. Picture taken July 30, 2020. REUTERS/Issei Kato 

Terumi Tanaka, a Nagasaki atomic bombing survivor and co-chairperson of Nihon Hidankyo, a country-wide organisation of atomic and hydrogen bomb sufferers, poses for a photograph during an interview with Reuters at the Nihon Hidankyo office in Tokyo, Japan July 30, 2020. Picture taken July 30, 2020. REUTERS/Issei Kato 

Pope Francis holds a picture depicting a victim of the 1945 atomic bombing in Nagasaki as he speaks to reporters onboard the plane for his trip to Chile and Peru January 15, 2018. REUTERS/Alessandro Bianchi 

Japanese Prime Minister Shinzo Abe (L) bids a farewell to U.S. President Barack Obama near the Atomic Bomb Dome (R) after visiting Hiroshima Peace Memorial Park to offer a prayer for victims of the atomic bombing in 1945 in Hiroshima, western Japan, May 27, 2016. REUTERS/Kimimasa Mayama/Pool 

A Japan Self-Defense Force CH-47 helicopter flies over the Atomic Bomb Dome at Peace Memorial Park in Hiroshima, Japan May 27, 2016. REUTERS/Toru Hanai 

Police officers guard in front of the Atomic Bomb Dome at Peace Memorial Park in Hiroshima, Japan May 27, 2016. REUTERS/Toru Hanai 

Police officers stand guard near the Atomic Bomb Dome at Peace Memorial Park in Hiroshima, Japan May 27, 2016. REUTERS/Toru Hanai 

Students pray in front of the cenotaph for the victims of the 1945 atomic bombing, at Peace Memorial Park in Hiroshima, Japan May 27, 2016. REUTERS/Toru Hanai 

Kinuyo Ikegami, 84, prays in front of the cenotaph for the victims of the 1945 atomic bombing, at Peace Memorial Park in Hiroshima, Japan May 27, 2016. REUTERS/Toru Hanai 

Kinuyo Ikegami, 84, prays in front of the cenotaph for the victims of the 1945 atomic bombing, at Peace Memorial Park in Hiroshima, Japan May 27, 2016. REUTERS/Toru Hanai 

A man prays in front of the cenotaph for the victims of the 1945 atomic bombing, at Peace Memorial Park in Hiroshima, Japan May 26, 2016 a day before U.S. President Barack Obama and Japanese Prime Minister Shinzo Abe arrive in the city. REUTERS/Toru Hanai 

People look at the Atomic Bomb Dome at Peace Memorial Park in Hiroshima,Japan May 26, 2016 a day before U.S. President Barack Obama and Japanese Prime Minister Shinzo Abe arrive in the city. REUTERS/Toru Hanai 

Japanese riot police guard near the Atomic Bomb Dome at the Peace Memorial Park in Hiroshima, Japan May 26, 2016 a day before U.S. President Barack Obama and Japanese Prime Minister Shinzo Abe arrive in the city. REUTERS/Toru Hanai 

Japanese riot police guard in front of the Atomic Bomb Dome at the Peace Memorial Park in Hiroshima, Japan May 26, 2016 a day before U.S. President Barack Obama and Japanese Prime Minister Shinzo Abe arrive in the city. REUTERS/Toru Hanai 

Japanese riot police guard in front of the Atomic Bomb Dome at the Peace Memorial Park in Hiroshima, Japan May 26, 2016 a day before U.S. President Barack Obama and Japanese Prime Minister Shinzo Abe arrive in the city. REUTERS/Toru Hanai 

Japanese riot police guard in front of the Atomic Bomb Dome at the Peace Memorial Park in Hiroshima, Japan May 26, 2016 a day before U.S. President Barack Obama and Japanese Prime Minister Shinzo Abe arrive in the city. REUTERS/Toru Hanai 

Japanese protesters holding placards to protest against U.S. President Barack Obama and Japanese Prime Minister Shinzo Abe visiting Hiroshima, march in front of the Atomic Bomb Dome at the Peace Memorial Park in Hiroshima, Japan May 26, 2016 a day before the leaders arrive in the city. REUTERS/Toru Hanai 

A Japanese demonstrator protests against U.S. President Barack Obama and Japanese Prime Minister Shinzo Abe visiting Hiroshima, in front of the Atomic Bomb Dome at the Peace Memorial Park in Hiroshima, Japan May 26, 2016 a day before the leaders arrive in the city. REUTERS/Toru Hanai 

Japanese demonstrators protest against U.S. President Barack Obama and Japanese Prime Minister Shinzo Abe visiting Hiroshima, in front of the Atomic Bomb Dome at the Peace Memorial Park in Hiroshima, Japan May 26, 2016 a day before the leaders arrive in the city. REUTERS/Toru Hanai 

Japanese demonstrators protest against U.S. President Barack Obama and Japanese Prime Minister Shinzo Abe visiting Hiroshima, in front of the Atomic Bomb Dome at the Peace Memorial Park in Hiroshima, Japan May 26, 2016 a day before the leaders arrive in the city. REUTERS/Toru Hanai 

Terumi Tanaka, a survivor of the atomic bombing and head of a national organization of bombing survivors called Nihon Hidankyo, attends a news conference at the Foreign Correspondents' Club of Japan in Tokyo, Japan, May 19, 2016. REUTERS/Issei Kato 

Terumi Tanaka (R), a survivor of the atomic bombing and head of a national organization of bombing survivors called Nihon Hidankyo, and Toshiki Fujimori, a survivor of the atomic bombing and assistant general secretary of Nihon Hidankyo, arrive for a news conference at the Foreign Correspondents' Club of Japan in Tokyo, Japan, May 19, 2016. REUTERS/Issei Kato 

Terumi Tanaka (R), a survivor of the atomic bombing and head of a national organization of bombing survivors called Nihon Hidankyo, and Toshiki Fujimori, a survivor of the atomic bombing and assistant general secretary of Nihon Hidankyo, arrive for a news conference at the Foreign Correspondents' Club of Japan in Tokyo, Japan, May 19, 2016. REUTERS/Issei Kato 

Terumi Tanaka, a survivor of the atomic bombing and head of a national organization of bombing survivors called Nihon Hidankyo, attends a news conference at the Foreign Correspondents' Club of Japan in Tokyo, Japan, May 19, 2016. REUTERS/Issei Kato TPX IMAGES OF THE DAY

A man moves paper lanterns as they float on the Urakami river in remembrance of atomic bomb victims on the 70th anniversary of the bombing of Nagasaki, in western Japan, August 9, 2015, on the 70th anniversary of the bombing of the city. A bell tolled in Nagasaki on Sunday morning as the Japanese city marked 70 years since the dropping of the last atomic bomb on a civilian target in the closing days of World War Two. REUTERS/Toru Hanai 

A girl runs among paper lanterns in remembrance of atomic bomb victims on the 70th anniversary of the bombing of Nagasaki, in western Japan, August 9, 2015, on the 70th anniversary of the bombing of the city. A bell tolled in Nagasaki on Sunday morning as the Japanese city marked 70 years since the dropping of the last atomic bomb on a civilian target in the closing days of World War Two. REUTERS/Toru Hanai 

A man moves paper lanterns as they float on the Urakami river in remembrance of atomic bomb victims on the 70th anniversary of the bombing of Nagasaki, in western Japan, August 9, 2015, on the 70th anniversary of the bombing of the city. A bell tolled in Nagasaki on Sunday morning as the Japanese city marked 70 years since the dropping of the last atomic bomb on a civilian target in the closing days of World War Two. REUTERS/Toru Hanai 

Catholics holding torches leave Urakami Cathedral for a peace march to the Peace Park in Nagasaki, western Japan, August 9, 2015, on the 70th anniversary of the bombing of Nagasaki. A bell tolled in Nagasaki on Sunday morning as the Japanese city marked 70 years since the dropping of the last atomic bomb on a civilian target in the closing days of World War Two. REUTERS/Toru Hanai 

People march with the head of the atom-bombed statue of the Virgin Mary, from Urakami Cathedral for a peace march to the Peace Park in Nagasaki, western Japan, August 9, 2015, on the 70th anniversary of the bombing of Nagasaki. A bell tolled in Nagasaki on Sunday morning as the Japanese city marked 70 years since the dropping of the last atomic bomb on a civilian target in the closing days of World War Two. REUTERS/Toru Hanai 

People march with the head of the atom-bombed statue of the Virgin Mary, from Urakami Cathedral for a peace march to the Peace Park in Nagasaki, western Japan, August 9, 2015, on the 70th anniversary of the bombing of Nagasaki. A bell tolled in Nagasaki on Sunday morning as the Japanese city marked 70 years since the dropping of the last atomic bomb on a civilian target in the closing days of World War Two. REUTERS/Toru Hanai 

A Catholic nun holding a torch leaves Urakami Cathedral (top) for a peace march to the Peace Park in Nagasaki, western Japan, August 9, 2015, on the 70th anniversary of the bombing of Nagasaki. A bell tolled in Nagasaki on Sunday morning as the Japanese city marked 70 years since the dropping of the last atomic bomb on a civilian target in the closing days of World War Two. REUTERS/Toru Hanai 

Catholics holding torches leave Urakami Cathedral for a peace march to the Peace Park in Nagasaki, western Japan, August 9, 2015, on the 70th anniversary of the bombing of Nagasaki. A bell tolled in Nagasaki on Sunday morning as the Japanese city marked 70 years since the dropping of the last atomic bomb on a civilian target in the closing days of World War Two. REUTERS/Toru Hanai 

Catholics holding torches leave Urakami Cathedral for a peace march to the Peace Park in Nagasaki, western Japan, August 9, 2015, on the 70th anniversary of the bombing of Nagasaki. A bell tolled in Nagasaki on Sunday morning as the Japanese city marked 70 years since the dropping of the last atomic bomb on a civilian target in the closing days of World War Two. REUTERS/Toru Hanai 

Catholics holding torches leave Urakami Cathedral (top L) for a peace march to the Peace Park in Nagasaki, western Japan, August 9, 2015, on the 70th anniversary of the bombing of Nagasaki. A bell tolled in Nagasaki on Sunday morning as the Japanese city marked 70 years since the dropping of the last atomic bomb on a civilian target in the closing days of World War Two. REUTERS/Toru Hanai 

Catholics holding torches leave Urakami Cathedral for a peace march to the Peace Park in Nagasaki, western Japan, August 9, 2015, on the 70th anniversary of the bombing of Nagasaki. A bell tolled in Nagasaki on Sunday morning as the Japanese city marked 70 years since the dropping of the last atomic bomb on a civilian target in the closing days of World War Two. REUTERS/Toru Hanai TPX IMAGES OF THE DAY

Nagasaki Mayor Tomihisa Taue walks to deliver his speech during a ceremony commemorating the 70th anniversary of the 1945 atomic bombing of the city at Nagasaki's Peace Park in Nagasaki, western Japan, August 9, 2015. A bell tolled in Nagasaki on Sunday morning as the Japanese city marked 70 years since the dropping of the last atomic bomb on a civilian target in the closing days of World War Two. REUTERS/Toru Hanai 

Japan's Prime Minister Shinzo Abe attends a ceremony commemorating the 70th anniversary of the 1945 atomic bombing of the city, at Nagasaki's Peace Park in Nagasaki, western Japan, August 9, 2015. Abe on Sunday marked the 70th anniversary of the atomic bombing of Nagasaki by renewing his commitment to a nuclear weapons free Japan, following criticism for not making the same pledge on the anniversary of the Hiroshima bombing last week.. REUTERS/Toru Hanai 

Women pray for victims of the 1945 atomic bombing in front of the Peace Statue before a ceremony commemorating the 70th anniversary of the bombing at Nagasaki's Peace Park in Nagasaki, western Japan, August 9, 2015. A bell tolled in Nagasaki on Sunday morning as the Japanese city marked 70 years since the dropping of the last atomic bomb on a civilian target in the closing days of World War Two. REUTERS/Toru Hanai 

A woman (C) is surrounded by photographers as she prays for victims of the 1945 atomic bombing in front of the Peace Statue before a ceremony to commemorate the 70th anniversary of the bombing at Nagasaki's Peace Park in Nagasaki, western Japan, August 9, 2015. A bell tolled in Nagasaki on Sunday morning as the Japanese city marked 70 years since the dropping of the last atomic bomb on a civilian target in the closing days of World War Two. REUTERS/Toru Hanai 

Former Malaysian prime minister Mahathir Mohamad (L) and his wife Siti Hasmah offer a flower wreath for the victims of the 1945 atomic bombing, during a ceremony commemorating the 70th anniversary of the bombing of the city at Nagasaki's Peace Park in Nagasaki, western Japan, August 9, 2015. A bell tolled in Nagasaki on Sunday morning as the Japanese city marked 70 years since the dropping of the last atomic bomb on a civilian target in the closing days of World War Two. REUTERS/Toru Hanai 

People offer silent prayers for victims of the 1945 atomic bombing, during a ceremony commemorating the 70th anniversary of the bombing of the city at Nagasaki's Peace Park in Nagasaki, western Japan, August 9, 2015. A bell tolled in Nagasaki on Sunday morning as the Japanese city marked 70 years since the dropping of the last atomic bomb on a civilian target in the closing days of World War Two. REUTERS/Toru Hanai 

Japan's Prime Minister Shinzo Abe attends a ceremony commemorating the 70th anniversary of the 1945 atomic bombing of the city at Nagasaki's Peace Park in Nagasaki, western Japan, August 9, 2015. A bell tolled in Nagasaki on Sunday morning as the Japanese city marked 70 years since the dropping of the last atomic bomb on a civilian target in the closing days of World War Two. REUTERS/Toru Hanai 

People offer silent prayers for victims of the 1945 atomic bombing, during a ceremony commemorating the 70th anniversary of the bombing of the city at Nagasaki's Peace Park in western Japan August 9, 2015. Japan marked on Sunday the 70th anniversary of the attack on Nagasaki, where the U.S. dropped a second atomic bomb on August 9, 1945, which killed about 40,000 instantly. REUTERS/Toru Hanai 

U.S. Under Secretary of State for Arms Control and International Security Rose Gottemoeller (2nd L) and U.S. Ambassador to Japan Caroline Kennedy (R) attend a ceremony commemorating the 70th anniversary of the 1945 atomic bombing of the city at Nagasaki's Peace Park in western Japan August 9, 2015. Japan marked on Sunday the 70th anniversary of the attack on Nagasaki, where the U.S. dropped a second atomic bomb on August 9, 1945, which killed about 40,000 instantly. REUTERS/Toru Hanai 

U.S. Under Secretary of State for Arms Control and International Security Rose Gottemoeller (C) attends a ceremony commemorating the 70th anniversary of the 1945 atomic bombing of the Nagasaki at Nagasaki's Peace Park, western Japan, August 9, 2015. Japan marked on Sunday the 70th anniversary of the attack on Nagasaki, where the U.S. dropped a second atomic bomb on August 9, 1945, which killed about 40,000 instantly. REUTERS/Toru Hanai 

Japan's Prime Minister Shinzo Abe offers a flower wreath for the victims of the 1945 atomic bombing, during a ceremony commemorating the 70th anniversary of the bombing of the city at Nagasaki's Peace Park in western Japan, August 9, 2015. Japan marked on Sunday the 70th anniversary of the attack on Nagasaki, where the U.S. dropped a second atomic bomb on August 9, 1945, which killed about 40,000 instantly. REUTERS/Toru Hanai 

Japan's Prime Minister Shinzo Abe offers a silent prayer for victims of the 1945 atomic bombing, during a ceremony commemorating the 70th anniversary of the bombing of the city at Nagasaki's Peace Park in western Japan, August 9, 2015. Japan marked on Sunday the 70th anniversary of the attack where the U.S. dropped a second atomic bomb on August 9, 1945, which killed about 40,000 instantly. REUTERS/Toru Hanai 

Doves fly over the Peace Statue in Nagasaki's Peace Park during a ceremony commemorating the 70th anniversary of the bombing of the city in Nagasaki, western Japan, August 9, 2015. Japan marked on Sunday the 70th anniversary of the attack where the U.S. dropped a second atomic bomb on August 9, 1945, which killed about 40,000 instantly. REUTERS/Toru Hanai 

Doves fly over the Peace Statue in Nagasaki's Peace Park during a ceremony commemorating the 70th anniversary of the bombing of the city in Nagasaki, western Japan, August 9, 2015. Japan marked on Sunday the 70th anniversary of the attack where the U.S. dropped a second atomic bomb on August 9, 1945, which killed about 40,000 instantly. REUTERS/Toru Hanai 

A family prays for victims of the 1945 atomic bombing in front of the Peace Statue before a ceremony commemorating the 70th anniversary of the bombing at Nagasaki's Peace Park, western Japan, August 9, 2015. Japan marks on Sunday the 70th anniversary of the attack on Nagasaki, where the U.S. dropped a second atomic bomb on August 9, 1945, which killed about 40,000 instantly. REUTERS/Toru Hanai 

People pray for victims of the 1945 atomic bombing in front of the Peace Statue before a ceremony commemorating the 70th anniversary of the bombing at Nagasaki's Peace Park, western Japan, August 9, 2015. Japan marks on Sunday the 70th anniversary of the attack on Nagasaki, where the U.S. dropped a second atomic bomb on August 9, 1945, which killed about 40,000 instantly. REUTERS/Toru Hanai