Why are you so sure the information won't be shared?
It just won't be published in the Guardian or the Times.
If I were in charge of the investigation, I sure as hell wouldn't publish my findings to the world. Why let the terrorists know that you've figured out their method. If they think you are clueless, they may try it again and you'll be ready and not only get the operatives but their support personnel as well.
As far as an independent investigation, no, I don't see that happening. As I said, the Russian system is very different from ours.
Not better or worse, just different.

troll