Radar alerts were reported across Russia, including the Black Sea coast, between 11:45 PM UTC on September 8th and 12:15 AM UTC on September 9th. A specific alert for "PCR Neptune" was noted on the Black Sea coast. The "Radarrussiia" channel on Telegram reported widespread radar activity, indicating potential aerial threats. The Nizhny Novgorod region was specifically mentioned in relation to these reports. Further details regarding the nature or origin of the reported radar activity were not immediately available from the provided sources.