I spotted this short transmission on 7823.5 KHz/USB at 0827z, it's an FSK modulation with 200Hz shift and speed of 150bps. I asked my friend KarapauZ about the name of this system and he told me that this signal is correlated with the CIS Selcall and it's also known with the nickname "Vishnya" ("Cherry" in English language) from the name of the radio equipment R-016V "Вишня".
The signal is discussed here in radioscanner:
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