If you read some of the other stories, it's clear that the FBI had their number years ago, including compromising the Russians communications, and the ability to decipher their cryptology. Essentially, the government already knew everything the spies knew. This wasn't the end of a Russian intel ring, this was the end of a carefully crafted and extremely well-executed US counter-intelligence operation.
Well, I appreciate the alternative viewpoint. I’m not completely opposed to it. Good to know...