According to the flight data published on the Flightradar24, it seems the aircraft disappeared from GPS coverage/was jammed/reported inaccurate data for quite some time, and the heading completely changed at that point/during that moment, which is when it diverted and eventually crashed.

So what you see in that footage is the very last moments, while it seems the actual hit might have happened m̶i̶n̶u̶t̶e̶s̶ some time before that.

Yeah... Because the plane was hit all the way on the other side of the Caspian sea around Grozny.

If you had read reputable news instead of relying on social media footage you'd have a better grasp of reality.