This was reported by the British Ministry of Defense on Twitter.
British intelligence notes that on February 26, Belarusian partisan group BYPOL and opposition leaders reported that a Russian A-50 reconnaissance UAV was damaged in a UAV attack on the Machulishchy airbase. BYPOL reported 2 explosions and damage to the front and middle parts of the A-50, as well as the radar antenna.
The A-50 is a Russian airborne early warning and control platform. Its role is to create a recognized air picture and ensure coordination of neighboring fighters.
“Attribution and damage has not been officially corroborated. However, the loss of an A-50 MAINSTAY would be significant as it is critical to Russian air operations for providing an air battlespace picture. This will likely leave 6 operational A-50s in service, further constraining Russian air operations," the British intelligence concluded.
On February 26, 2 explosions reportedly occurred at the Machulishchy military airfield near Minsk, damaging a Russian A-50 reconnaissance UAV and snow removal equipment.