https://www.cbsnews.com/news/azerbaijan-russia-air-plane-crash-blame-unintentional/

“First, the Russian side must apologize to Azerbaijan. Second, it must admit its guilt. Third, punish the guilty, bring them to criminal responsibility”

Unpopular opinion: the parties that are criminally responsible for the shoot down of flight 8243 include the airline management and the pilots themselves.

Purely from a passenger safety point of view it was criminally irresponsible to fly a passenger airplane into Russia. Ukraine is, quite rightfully, waging an extensive drone warfare war against Russia, and planes are going to get shot down. Secondly, it's obviously morally wrong to support the Russian economy by flying planes to Russia. And finally, it's Russia: we know they're immoral scrumbags. You can reasonably expect Russia to do things like intentionally try to kill off planes they shot down by accident. That significantly increases the risks.

If the pilots hadn't died, they should have gotten criminal charges for agreeing to do this flight. As should the entire management chain above them who planned and approved this flight.

As for the Russians manning the anti-air defenses, what they've done that was criminal was showing up to work at all. Trying to prevent Ukraine from winning is a deeply immoral act.