Another F-16...

"Non-standard situation on board"

Via ОБОРОНКА:

The Ukrainian Air Force has reported the loss of another fighter jet, the F-16, which was supplied by Western countries. The incident occurred on the evening of July 29 in the Poltava region. The preliminary explanation for the crash is a "non-standard situation on board." However, as always, other possibilities cannot be ruled out, including Russian Aerospace Forces activity, collision with a drone, and so on.