YAESU FRG-7000 - UVB 76 (then MDZhB and now ZhUOZ) - Mysterious radio on 4625 kHz HD

A really mysterious radio called "The Buzzer" on shortwave bands. The radio is located in Russia. Very good signal. QTH Marseilles, south of France with my YAESU FRG-7000... July 28th 2016, 22h54 local time, so 20h54 GMT