Airlines, including Qantas, quit flying over Ukraine airspace months ago
Kiev shuts down airspace over southeast Ukraine
You need to look into why there are videos of chaff falling down on the wreckage site.
The FAA has nothing to do with non-USA owned flights not over American territory.
If you re looking for a conspiracy, consider looking into just how many of the Russian-speaking separatists are actually Russian officers on assignment from the Russian military--answer: most of them.