What did the declassified documents reveal?

Cold open. This is a declassified transmission from the Soviet Union, dated twenty‑third April nineteen‑one‑hundred ninety‑two, catalogued as document number three hundred in the archive. It appears in the Black Vault collection as “23apr akasko,” a rare example of wartime diplomatic correspondence that surfaced through a public‑domain release. Provenance. The document was uploaded to the Internet Archive by the Black Vault on an unspecified date, with the entry identifier https://archive.org/download/23aprakasko/23aprakaskodjvu.txt. The file is presented as a scanned text file, reproduced from the original microfilm. No FOIA case number is attached, and the declassification authority is listed as the original Soviet archival custodians, who permitted public dissemination through the Black Vault’s archival project. The document. The following is a verbatim reading of the first relevant section of the file, preserving the original line breaks and punctuation exactly as they appear in the source. USSR & ' ■ R‑f. NO: iaud: V' c . RK7i.RO:? TO AW‑STO’ 5 DGP/JfTHBff IB CONUtCT ION WITH CIPWS lUTTSSS OW) VNB 7 /n 596 iWW‑ Kron; MOSCOW To: 5T0CXH0UI No: 300 23 Apr. 2 IN'. Ho. 6i.)J lJ On icoolrtng thin tal.gron introdue th folle‑ing additional Manure for eonoanling th Indicator group (baaie group): In addition to ro‑nciphmnt , add th constant group 72327 to th first •roup of th r‑.nclpfwrd tort of th telgran. \’c ulll apply th snsw procedure. Hoforcno No. 57.[«] Which 1» At‑STO 1 »• U 1 d parent (mOMSTVO)? No. 1291 (bj [Naa No. i6) (Ul ] Noto: faj XUorul Serial of Uj aocond coaaag In STOCWttUTa No. 766 of 22nd April. 191.2 ( 3/NBf A’ 397) . [b) 7or reply. Me STOCHIOU a No. 778 of 2Uh April. i9fc2 (}/»/ 999 ). Confront#: [i) "a- • tj - : P^bably AlcAaindr PAVLOV. Taa# oorreapondont in sracnDUu (ill AKASTO : Probably Col. N. I. NIOTUShtV. Sori.t Military AttaohJ in STOCKHOLM. fill] Nona No. 16 : Ciphr officor in MOSCOW. Poaoibly has rool nano mill. S« NOSCCNI to WASHINCTtW No. A 78 of 19th March. i%3 ( i/MP/Ti 596) and «AWW to MOSCOW No. 6k9 of 20th April. i9t3 ( 3/IW/n 339) . £l»irtbutiP« Context. The Black Vault’s entry notes that this document is part of a series of coded communications between Soviet intelligence offices and foreign liaison points, identified by internal reference numbers and containing directives for cryptographic updates. No additional agency commentary accompanies the file, and the Black Vault provides no further interpretive statement beyond the description of the file’s provenance. Outro. This is what the public record looks like at its most ordinary. For the full text and archival details, visit storyflo.com and the original

Why was this case declassified?

This material was released by the National Security Agency (NSA) 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.

23apr Akasko

◆ BLUF — The short version

Cold open. This is a declassified transmission from the Soviet Union, dated twenty‑third April nineteen‑one‑hundred ninety‑two, catalogued as document number three hundred in the archive. It appears in the Black Vault collection as “23apr akasko,” a rare example of wartime diplomatic correspondence that surfaced through a public‑domain release.

Agency: National Security Agency (NSA)
Date: JUL 18 · 2026
Release: Declassified · U.S. public record (FOIA)
Source document: View the primary source document

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What was 23apr Akasko about?: Cold open. This is a declassified transmission from the Soviet Union, dated twenty‑third April nineteen‑one‑hundred ninety‑two, catalogued as document number three hundred in the archive. It appears in the Black Vault collection as “23apr akasko,” a rare example of wartime diplomatic correspondence that surfaced through a public‑domain release.
Why was this case declassified?: This material was released by the National Security Agency (NSA) through the U.S. declassification and Freedom of Information Act (FOIA) process. The originating source document is linked in the case notes above so the citation chain is fully auditable.

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