What did the declassified documents reveal?

This declassified C.I.A. record, dated November seventeenth, nineteen-fifty, details intelligence assessments regarding the probable consequences of expanding U.N. hostilities into Manchuria during the Korean War. This document is available on archive.org, cited from The Black Vault. This record was declassified under the Freedom of Information Act, though no specific F.O.I.A. case number is provided. It was released to the public on October twenty-ninth, two thousand and eight. The declassification authority is cited as the Interagency Security Classification Appeals Panel. The document is an Office Memorandum from the Bureau of Far Eastern Affairs to Mr. Rusk and Mr. Clubb, Department of State. Subject: Probable Consequences of Carrying U.N. Hostilities into Manchuria. Reference: C.I.A. Memorandum, November ninth, nineteen-fifty. The Bureau of Far Eastern Affairs finds itself unable to accept the opinion expressed in the final paragraph of the reference memorandum that "action by U.N. forces to attack troop concentrations or air fields north of the Yalu River, or to pursue enemy aircraft into Chinese territory would not increase the already substantial risk that the situation may degenerate into a general war involving Russia", and that such action would probably materially increase the extent of Chinese Communist reaction in Korea proper, only. The Bureau's reasoning is as follows: As set forth in the J.I.I.C. report of November ninth, there was information indicating that a northward troop movement from the south and east China areas had been under way for the past month, and that it was apparently accelerated in late October, and that "almost all recent information points to a heavy and accelerated build-up of Chinese Communist strength in northeast China". The reference report noted that "Open Communist acceptance of responsibility for the fate of North Korea has also become apparent in statements from Moscow and Eastern Europe in the past few days. The contrast of these statements with Communist Party efforts only a few weeks ago to play down the question of intervention in Korea is striking. The unreserved nature of the propaganda implies an intent to turn the tide in Korea through an unofficial war by the Chinese Communists." The report admitted that "it still cannot be determined conclusively whether the objective of the Chinese Communists is to tie down U.N. forces in Korea for an indefinite period or whether they are making preparations for an offensive to attempt to drive the U.N. forces out of Korea." It observed further that "The scale of the Chinese military build-up in Northeast China, however, is indicative of a growing military capability beyond any apparent defensive needs, and the increasing belligerency of Chinese propaganda also indicates the beginnings of a campaign to prepare their people for continuing if not augmented support of the North Korean Communists. The risk of war which the Chinese have assumed further raises…

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-006Declassified

Filed OCT 29 · 2026Runtime 1 min

CIA This Declassified CIA

U.S. public record · FOIAUpdated October 29, 2026

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◆ BLUF — The short version

A. N. hostilities into Manchuria during the Korean War. org, cited from The Black Vault. A. case number is provided. It was released to the public on October twenty-ninth, two thousand and eight. The declassification authority is cited as the Interagency Security Classification Appeals Panel.

Date: OCT 29 · 2026
Release: Declassified · U.S. public record (FOIA)
Source document: View the primary source document

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This declassified C.I.A. record, dated November seventeenth, nineteen-fifty, details intelligence assessments regarding the probable consequences of expanding U.N. hostilities into Manchuria during the Korean War. This document is available on archive.org, cited from The Black Vault. This record…

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What was CIA This Declassified CIA about?: A. N. hostilities into Manchuria during the Korean War. org, cited from The Black Vault. A. case number is provided. It was released to the public on October twenty-ninth, two thousand and eight. The declassification authority is cited as the Interagency Security Classification Appeals Panel.
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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