Lots of people here are referring to eventual lack of basic flying skills to explain that one. If we were talking about an operator using MPLs with 150h on the right seat or accepting shady licences , perhaps, that would be relevant, but in Russia ? Flying in Russia was (still) includes some of the most regulated professions there and basic flying training was far above some western standards. I do not think things have changed much since my time there. But wait to be corrected.
I was told once that Antonov Russian build aircraft were fitted with ( old) Russian avionics and automation , unlike the Ukrainians built ones , which are fitted with standard Western avionics. Can someone in the know confirm this ?