At the beginning of March 2022, Russian forces passed by a platoon sized element (4) of Ukrainian built BTR-4Es, all abandoned, with none showing signs of combat!
They carried the Red Cross insignia of the Ukrainian Ground Forces. Going by the ‘Z’ symbol on the Russia vehicles this was in the Donbas Area of Operation.
Video, apparently the BTR-4Es can’t handle the mud:
Vehicle I-D: