I presume it's because the International community are applying pressure to make them raise those reactors...I think they're even paying for it.
The front end is a mangled wreck by the look of it. It has no value to the West, and the Rooskies probably can't afford to lift it just for a 'look see'.
The documentary was good though. When they proposed the US sub collision theory I just started chuckling to myself at the new threads we'd be seeing on Jetblast.
Spy Plane mark 2.