And just why do you think that the aforementioned investigation will never take place?
I think that, not only will it take place, but that, indeed, it has already begun.
The likelihood of the results of that investigation ever becomming public knowledge, however, is remote. The Russian system is very different from either the British or American systems. They have a legacy of secrecy that will endure for many years. Such things as independent investigators simply do not exist in Russia.
Why do you feel that only an independent investigation can answer the questions you have raised? The Russian Govt. is probably just as interested as you, Kevin, in finding out what happened, but you seem to feel that you should have access to that knowledge; knowledge that could well contain items about breaches of national security.
Why is it so important for YOU to know exactly what happened?

troll