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Digital Archive International History Declassified

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  • October 02, 1944

    Letter from Boris Merkulov (USSR People’s Commissar for State Security) to Lavrenty Beria (USSR People’s Commissar for Internal Affairs)

    Letter from Merkulov to Beria regarding the KGB’s efforts to obtain information about the creation of the atomic bomb and specifically about the related problems with uranium

  • September, 1945

    G.J. Malik, 'Clarifications on the Compilation [about the Atomic Bomb]'

    Soviet ambassador Yakov Malik introduces a compilation of eyewitness materials and data gathered in the aftermath of the atomic bombings of Hiroshima and Nagasaki. Staff members from the Soviet embassy in Tokyo were sent to survey the explosion sites, speaking personally with survivors and capturing footage of the affected cities.

  • September, 1945

    Atomic Bomb (Report of the Group of [Soviet] Embassy Staff Members Who Visited Hiroshima)

    A group of staff members from the Soviet Embassy in Tokyo interviewed Japanese witnesses of the atomic bomb explosions in Hiroshima and Nagasaki. They found that the two bombs wreaked havoc on the bodies of those within a small radius of the explosion; most survivors exhibited severe burns, a decreased white blood cell count, and injuries from broken glass. Witnesses from outside this radius faced less severe injuries, and the Embassy staff note that the Japanese press has been exaggerating the effects of the atomic bomb in order to justify the nation’s unconditional surrender.

  • October 09, 1945

    TASS Digest, 'Reactions to Truman's Message to Congress about the Atomic Bomb; etc.'

    Stories include disputes in the US about putting the atomic bomb under international supervision, a speech by Truman on the atomic bomb, British conservative party politics, the dissolution of the national assembly in Portugal, elections in Budapest, and a speech by British Foreign Secretary Bevin on the conference of ministers of foreign affairs.

  • October 11, 1945

    TASS Digest, 'Byrnes' Statement at a Press Conference; etc.'

    Excerpts from a press conference by James Byrnes on the creation of a Far East Consultative Commission, as well as articles on the atomic bomb, the Council of Foreign Ministers, and a new civilian advisor for Jewish matters appointed by General Eisenhower.

  • October 12, 1945

    TASS Digest, 'The Mexican Press about Byrnes' Statement; etc.'

    Excerpts from articles on James Byrnes, General Mark W. Clark, Clement Attlee, and US refusal to share technical information about the atomic bomb.

  • November 28, 1945

    Beria’s Cover Memo to Stalin on Niels Bohr

    Memo to Stalin discussing Beria’s efforts to obtain information from physicist Niels Bohr about development of the atomic bomb.

  • November 28, 1945

    The Interrogation of Niels Bohr

    At the end of October 1945 two NDVD employees of the “S” Department for atomic intelligence activities were sent to Denmark to establish contact and speak with Niels Bohr. They managed to meet Bohr at his institute twice, on 14 and 16 November 1945, and obtained answers to 22 questions on constructing a nuclear reactor and the atomic bomb.

  • December, 1945

    Kurchatov’s Evaluation of Niels Bohr's Questioning

    Evaluation by the scientific director of the Soviet nuclear project, Igor Kurchatov, of the interview with Niels Bohr.

  • October 27, 1946

    Cable Nos. 97-98, Molotov to Druzhkov [Stalin]

    A cable discussing Molotov's intention to give a speech at the UN about veto powers, atom bombs, and arm reductions. He will offer a proposal from the Soviet delegation calling for universal arms reductions, a ban on the use of atomic energy for warlike aims, and efforts towards global peace and security.

  • June 15, 1947

    New York Herald Tribune, European edition, 'Joliot-Curie Rips America for Atomic Energy Report'

    French High Commissioner for Atomic Energy, Joliot-Curie, criticizes Henry DeWolf Smyth of Princeton University for omitting from his report the “vital contributions of French science to the discoveries leading to the making of atomic bombs.”

  • February 28, 1955

    Report by the Measurement Lab of the USSR Academy of Science, 'On the Properties of the Atomic Bombs Detonated on the Marshal Islands in 1954'

    Soviet scientific intelligence report on U.S. nuclear weapons testing on the Marshall Islands in 1954. This report concludes that the Ivy Mike and Castle nuclear detonations were thermonuclear based on gamma ray spectroscopy of fission fragments collected by Soviet aircraft over the USSR and PRC.

  • August 13, 1985

    Ciphered Telegram No. 214, Embassy of Hungary in India to the Hungarian Foreign Ministry

    Information on the current status of both Pakistan and India's nuclear programs. The opinion of Indian Vice President Venkataraman is that Pakistan is lying about having already completed an atomic bomb.