On October 21, the authorities issued an RO-Alert message for northeastern Tulcea County after the radar system of the Ministry of National Defence detected a group of aerial targets in Ukrainian airspace, in the Vâlcove area. The message was sent at 03:34, through notification from the National Military Command Center to the General Inspectorate for Emergency Situations, and the population was urged to take shelter in basements or civil protection shelters or, if they had none, to remain indoors, away from windows and exterior walls. The Ministry of National Defence later stated that no incursions into national airspace had been reported, and the alert ended at 04:02, with no calls to 112 reported by the Tulcea Inspectorate for Emergency Situations.
A few days earlier, on the morning of October 14, the Ministry of National Defence radar detected aerial targets near the town of Vâlkove (Ukraine), and an RO-Alert was sent at 6:39. At that time, two F-16 aircraft and an IAR-330 SOCAT helicopter were scrambled for monitoring, and the warning was described as a precautionary measure, pending clarification of the situation.