“Italian radio/space enthusiasts reported Russian voice transmission saying ‘the world won’t know ..’”
Interesting. Do you know the date of the transmission?
I read an article in an old Reader’s Digest decades ago. The Italians had bought surplus military radios from the U.S. Army (surplus WW2 radio equipment was very popular among do-it-yourself radio enthusiasts).
The magazine may have been a 1965? Many of my old magazines were ruined by water some years back. Maybe search find something?