Airlines are now paying extra-close attention to this, so I really wouldn’t worry at all when flying through this region. (No one is flying over Ukraine or conflict regions inside Ukraine anymore, anyway, but there is really no reason at all to worry about Russia.) It’s rare that civilian airplanes are shot down with weapons, anyway. I don’t think there is any reason to worry. This won’t happen to you.

(Oh, now, don’t get me wrong, were I to fly through this region I would be more scared than I would otherwise be. However, that would be irrational on my part and in many ways an involuntary reaction and no reason to change my plans.)