A document released by the Japanese government says that the bombing of Tokyo by the United States in 1945 was against the “humanitarian principles of international law”. The document was endorsed by Prime Minister Shinzo Abe in response to a question filed by Mizuho Fukushima, leader of the opposition Social Democratic Party and an Upper House member.
However, the document does not directly criticize the US for their actions, only saying that there are varied opinions on whether or not the US acted in direct violation of international law during that time. It just mentions that at the time, the Japanese government filed a protest with the US government after the bomb raid that killed a little over 100,000 people in what is considered as the worst and deadliest single air raid of World War II. The US claims that the war with Japan during that time was being fought against fascism.
On March 10, 1945, around 330 American B-29s dropped incendiary bombs on Tokyo, in what was codenamed Operation Meetinghouse. The firestorm razed to the ground almost a quarter of the city and left more than a million people homeless. More air raids followed in April and May, but none as destructive as this one. Five months after the March raid, the Japanese surrendered to the US forces, leading to the end of World War II.