I can't connect to the Tass news item directly http://tass.com/science/896683 but on a SETI page an item dated August 31, 2016 says:

An article that quotes the Russian news agency TASS is suggesting that the signal found using the Russian RATAN-600 radio telescope is, indeed, terrestrial interference. The article, which can be found here – http://tass.com/science/896683 -- says in part “Director of the Institute of Applied Astronomy at the Russian Academy of Sciences Alexander Ipatov told TASS that back at the Soviet period he had been part of a group of young astronomers at the special astrophysical observatory searching for signals from extraterrestrial civilizations. ‘We, indeed, discovered an unusual signal. However, an additional check showed that it was emanating from a Soviet military satellite, which had not been entered into any of the catalogs of celestial bodies,’ Ipatov said.”

Are there really "Soviet" (as opposed to Russian) military satellites that are not in "any of the catalogs of celestial bodies"? For example, does the NORAD generated TLE database at space-track.org leave out satellites belonging to other countries' military as a courtesy for some reason?

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    $\begingroup$ The way I read it, that quote by Ipatov is referring to an event that occurred during the Soviet period, rather than to present-day uncatalogued Soviet satellites, $\endgroup$ Sep 3 '16 at 1:20
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    $\begingroup$ The way I read it, the quoted director was recounting his own prior Soviet-era experience as a parallel of the 2016 event. Soviet-era would imply 25 or more years ago. From what I've read on this SE, unlikely any unserviced satellite would have such a long operational or design lifetime, with military satellites likely having very short lives simply due to rapid obsolescence. If omitted from a catalog, more likely due to the Soviet military's attempt toward secrecy rather than courtesy on anyone else's part. $\endgroup$
    – Anthony X
    Sep 3 '16 at 1:40
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    $\begingroup$ I believe there is also American satellites not registered ... $\endgroup$
    – Antzi
    Sep 3 '16 at 8:04
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    $\begingroup$ The TASS article quotes Yulia Sotnikova, saying "an unusual signal was received but its analysis showed that it was most likely a terrestrial disturbance". It sounds to me like they don't know the exact source of the signal, only that it must be terrestrial. Ipatov was just relating a story about a similar but separate event. $\endgroup$ Sep 3 '16 at 22:15
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    $\begingroup$ @Antzi Yes. And also there are no military satellites of the US partners. For example Israel. $\endgroup$
    – A. Rumlin
    Sep 1 '20 at 18:10

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