Own air defence the “worst enemy” of Russian aviation?

In the context of the latest Ukrainian attack on the Engels-2 strategical bomber base close Saratov, there was — unconfirmed for the time being — information that the Russian air defense, responding to the attack, had shot down its own Su-27 fighter jet. Regardless of whether this information is confirmed, interesting opinions appeared in the Russian infosphere that Russian air defence was liable for “most of the downings” of Russian aircraft of the latest types.