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?