At 13 km from the border with Ukraine (the village of Nikolskoye, Belgorod region), a three-coordinate duty radar Kasta-2E2 (39N6) was spotted. The figure shows the target detection area.

For reference: Kasta-2E2 (39N6) is a Russian mobile three-coordinate radar station of the decimeter range of a circular view of the standby mode. It is designed to control airspace, determine the coordinates and identify air targets, including those at extremely low altitudes, their route characteristics and issuing their coordinates and movement parameters to air defense control systems (RTV, ZRV, IA), Air Force and military air defense.