What did the declassified documents reveal?

The declassified Central Intelligence Agency record titled “Report on the Likelihood of Sino‑Soviet Hostilities, Progress Report Number Seventeen,” dated three September nineteen seventy‑six, is notable because it presents a quantitative, Bayesian assessment of the risk of conflict between the People’s Republic of China and the Union of Soviet Socialist Republics during a tense period of the Cold War. The document is hosted at archive.org and was originally posted on The Black Vault. This report was released under a Freedom of Information Act request, declassified on eight July two thousand four. The declassification authority was the CIA’s Office of Information Management, and the full text is available through the Black Vault entry at archive.org/download/us‑china‑intel‑CI02083/CI02083djvu.txt. The document opens with the heading: “Directorate of Intelligence, Office of Political Research, Progress Report Number Seventeen, three September nineteen seventy‑six, The Likelihood of Sino‑Soviet Hostilities.” It explains that the project consists of two quantitative approaches to Sino‑Soviet relations. A team of analysts drawn from various components of the Central Intelligence Agency, each concerned with different aspects of Chinese and Soviet affairs, examines on a continuing basis evidence of the possibility of one or another level of Sino‑Soviet hostilities. The analysts’ latest numerical assessments of the likelihood of such hostilities, calculated according to the Bayesian formula of probabilities, are presented in a bar graph on page two, followed by a second graph showing the movement of the group’s assessments over the past few months. The second part of the project is a chart of overall Sino‑Soviet tensions, based upon subjective evaluations by the participants. Progress reports are to be published on a bimonthly basis by the Office of Political Research. Principal trends are summarized as follows: During the past two months there has been relatively little interaction between the Union of Soviet Socialist Republics and the People’s Republic of China, and the level of tension has remained virtually unchanged. New Soviet defenses and military installations continue to appear in the Far East, items six, seventeen, and eighteen. There are no other signs of impending hostilities, however, and the probabilities of the various scenarios on page two remain quite low. The report then lists items of evidence considered in the revision of twenty‑seven August. Item one notes that the People’s Republic of China ambassador stated that the acceleration of China’s nuclear missile program since nineteen sixty has now produced sufficient mid‑range nuclear missiles to destroy all major cities of the Union of Soviet Socialist Republics; consequently, this has alleviated the threat of a pre‑emptive strike against the Union of Soviet Socialist Republics. Item two records that the Council of Ministers of the Union of Soviet Socialist Republics sent a message…

Why was this case declassified?

This material entered the public record through the U.S. declassification and Freedom of Information Act (FOIA) process. The originating source document is linked on this page so the citation chain is auditable.

Case File · ARCHIVE-832Declassified

Filed AUG 5 · 2026Runtime 3 min

CIA The Declassified Central Intelligence Agency Record Titled “report On The

U.S. public record · FOIAUpdated August 5, 2026

cold-war

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The declassified Central Intelligence Agency record titled “Report on the Likelihood of Sino‑Soviet Hostilities, Progress Report Number Seventeen,” dated three September nineteen seventy‑six, is notable because it presents a quantitative, Bayesian assessment of the risk of conflict between the People’s Republic of China and the Union of Soviet Socialist Republics during a tense period of the Cold War.

Date: AUG 5 · 2026
Release: Declassified · U.S. public record (FOIA)
Source document: View the primary source document

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What was CIA The Declassified Central Intelligence Agency Record Titled “report On The about?: The declassified Central Intelligence Agency record titled “Report on the Likelihood of Sino‑Soviet Hostilities, Progress Report Number Seventeen,” dated three September nineteen seventy‑six, is notable because it presents a quantitative, Bayesian assessment of the risk of conflict between the People’s Republic of China and the Union of Soviet Socialist Republics during a tense period of the Cold War.
Why was this case declassified?: This material entered the public record through the U.S. declassification and Freedom of Information Act (FOIA) process. Storyflo narrates it directly from the public release.

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