I’ve been working for maybe the third day when i’ve heard it on some Internet radio station. The song was performed by Mary Hopkin. It’s tracing back to 1920-ies, was banned up to 1950-ies. Anyway Wikipedia knows more about it.
Dude, i’m feeling to old for rock-n-roll 
“Дорогой длинною”, Сергей Зыков :
“Those were the days”, Mary Hopkin:
“Quelli Erano Giorni”, Gigliola Cinquetti :
“Le temps des fleurs”, Dalida :
“An jenem Tag”, Dunja Rajter :
“Kelelis tolimas”, Virgis Stakėnas :