I'd guess the FBI has known about this for some time. I don't think they'd normally roll a network like this up right away, first impulse would be to try to use it to pass disinformation. The arrests suggest that any possible such use was not seen as particularly valuable, and of course that the timing was seen as useful.
If the Russians make arrests to trade they will have to admit that this was in fact a spy network, so far they don't seem to be doing that. We'll see...
Much of the media attention seems to be driven by the fact that one of the alleged spies is female and hot. Some things get more attention than others...
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