Here in the Russian media it has been confirmed that a soldier died, indeed. He was doing a simple technical work on the ground at the airbase. It was written about a suiside (because of a conflict with his girlfriend) but this sounds like a b-****, IMHO. Anyway, no connection to the war, such things happen every now and then.
Arrival of MANPADs was anticipated. This should make the AF group change the tactics. While -24s and -34s can operate at night and are more difficult targets, -25s are day birds and have to take special care.