Satellite photos reveal that Ukraine has destroyed and possibly damaged aircraft at the Kushchyovskaya airbase in Krasnodar Krai.

Photos reveal the destruction of an Su-27, 1 Su-34, and possible damage to an Su-30. Interestingly, based on the livery the Su-27 may be a part of the "Russian Knights" display team.

I'd recommend viewing the original source, as there is more analysis conducted there that goes into greater detail.