Russia is not likely to admit it, but the word is they shot down their own SU-27. This was after two drones had successfully taken out the control tower and several parked planes. Maria Drutska said she laughed so hard she cried.

Russia says it shot down Ukrainian drone near air base | AP News https://apnews.com/article/russia-ukraine-79f5db9b25a79acd53730689e97920f6