No, it would have been detected by various systems pretty much immediately. Those systems are military though, and probably wouldn’t tell the general public about the movement of military satellites
It’s also conceivable that it was detected in that orbit but not recognised, so it was treated as a mystery object
I’m pretty sure their concern is their own birth rate dropping, actually. Have you seen the demographics graph for Russia? They’re facing a complete collapse of their working-age population in a decade or two