Summary
Russian Rosaviatsiya and military air defense tracked an unidentifiable primary radar return, halting all airport operations.
Detail report
Russian Federal Air Transport Agency (Rosaviatsiya) and military air defense radar stations logged an unauthorized primary radar target hovering inside restricted airspace over Kazan, Tatarstan. Airport operations at Kazan International Airport were immediately suspended, halting all arrivals and departures. Primary air defense radar tracked the target performing high-altitude maneuvers before it accelerated beyond radar monitoring range.