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Russian Morse code obviously has its origins in Czar Russia (see https://otvet.mail.ru/question/84531350) and then in Soviet Union. We may simplify the situation saying that there was no Internet in either State. That means, nothing official was made public via that channel. This is the reason you cannot find mostly anything from that era.

Further, during the computerization in Russia, because there were 33 letters in Alphabet but a code segment in an ASCII derived table only permitted 32. For that reason, Ё was left out from the computer alphabets and only returned in late 90's via advent of Unicode. This example was to explain the problems with alphabets over 32 letters. (Believe me, you don't want to try Lithuanian or Polish keyboards.)

Further, Ъ (the "hard sign") is actually not a letter, it is an orthographic device,a service mark after a consonant, noticing the opposite to the palatalization. The lack of it NEVER changes the meaning and anybody having enough literacy, is able to recover that mark according to the known rules. Probably for this reason it was often left untransmitted, especially during the slow line speeds era (or, as we see below, coded as the "soft sign"). Morse tables of Soviet Army just ignored that sign.

Then started the "stealing from the West" era. Latin teletypes were obtained and rebuilt to have Cyrillic letters on it (like in the STA-M67 teletype model, see https://belokikm.ru/teletajp-telegrafnyj-apparat/). Very obviously that was the moment when the "hard sign" disappeared from some of the keyboards.

Currently there are three versions how the "hard sign" is transmitted via Morse. The simplest one is to use the palatalisation mark (the "soft sign") instead, and this is actually the Latin letter "X" (-..-). It creates no problem because these signs are mutually excluding.

The second way (that some sources cite), is the version of Ñ described above.

The third way is ... and b/c Tourngto wanted to have an "official" document, so let me introduce a table at the website of Ukrainian Army at https://ivms.mil.gov.ua/wp-content/uploads/2020/10/tabl-5.39.pdf defining the "hard sign" in Morse code as .--.-.

I am currently unable to define what is the book from where that description, but considering it is clearly done in letterpress technology, not the offset printing, I would sort the origin into 1970's. At that time Russia and Ukraine were yet one - the Soviet Republic.

Finally, listen to the audio tapes of the Soviet morse school (obviously from the army and DOSAAF) here: https://www.youtube.com/watch?v=f8bcJcthCbU and spot the 7m00s moment, it's said very clearly that both signs (hard and soft) are transmitted as the same.

Thus I recommend to stick to the variant two (Latin "X"): -..-

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Thread: cyrillic error