The visit by the president of Ukraine, which faces nuclear threats from Russia, to the A-bombed city of Hiroshima is highly significant to the Japanese prime minister’s pursuit of a “world without nuclear weapons.” If Kishida and Zelenskyy visited Peace Memorial Park in Hiroshima together, it would send a strong nuclear disarmament message. Japanese Prime Minister Fumio Kishida has welcomed plans for Ukrainian President Volodymyr Zelenskyy to attend the ongoing G7 summit in Hiroshima as an opportunity to make the group’s support for Kyiv and its refusal to tolerate Russian nuclear threats clear. China has dispatched special government envoys to countries including Russia and Ukraine to spark peace negotiations, but Europe, the United States and some other nations have criticized Beijing’s pro-Russian stance. Is Putin’s nuclear threat a bluff ?