This is the origin of the Radio Moscow’s interval signal.
“Wide Is My Motherland”
https://www.youtube.com/watch?v=9B4-mH1r7VY
I enjoyed their swinging version of “Moscow Nights”
https://www.youtube.com/watch?v=Zg6CfBtO_uw
Yes, I actually wrote Radio Moscow to ask for a copy of the USSR constitution. The only problem with it, I didn’t understand at the age of 13, is under the Soviet it had no force of law. IOW, it was pure propaganda.