>why these rings were separated from the engines?
In those two photos there is only one ring.
IMO:
-it can break off if the turbine blades consumed shrapnel or missile's tail section
-also when the missile blew away the nose of the plane, some of the flying debris might have gone into engine
-the blast wave of the warhead detonation
@onetrack
-it seems evident that missile came directly from ahead of the plane
-collision speed must have been 3000km/h+900km/h
-missile diameter is only 40cm
-buk missile does not leave much trail after 15s of flight (it flew ~28s before impact)
So, no one on the plane could take photo of the missile. And if pilots had a "dash cam", it's destroyed by the blast.
about the "new" clip:
-it has been said that the audio has been edited, they say that on a longer version of the video it would seem "rocket" mentions are muted out, but can be brought up by amplifying it back
-original video is not yet found