The Main Directorate of Intelligence of the Ministry of Defence of Ukraine claims that there was a sabotage on the Russian Chkalovski air base, near Moscow. On 18 September 2023.
“Unknown persons planted explosives on AN-148, IL-20 (both belonging to the 354th special purpose aviation regiment) and MI-28N helicopter.”
Unfortunately, there is not much data in open sources to confirm the information about the damaged Russian aircrafts. Hopefully more data will appear in the future.