re: What should US do if Russia crashes US computer network?

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our networks is far too distributed for them to be able to make a major impact. Anonymous is a group of very talented hackers, and they couldn't even cause minor disruption.

but if it were to happen, much of anonymous would go after russia's network, which isn't near as resilient. of course, they dont rely on it as much.

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This.

There are so many things to take into account for this to happen that it's nearly impossible. Our network is so dispersed that attacking one sole company, government group, etc isn't going to cut it. There would need to be a concerted, long-term effort to infect not only every Administration agency (Secret Service, FBI, CIA, NSA, etc) with some stuxnet-ish virus, but there would also have to be infections of backups as well as the systems of many private contractors. These groups take cyber-security VERY seriously.

On top of that, to have any long-lasting effect there would need to be attacks not only on the global DNS servers (which have insane levels of prevention and backups) but on whatever DNS servers the government uses on their own private network(s).

For that many systems to be taken down all at the same time for more than a day or three, you would have about as much luck as winning the Powerball and Mega-Millions while getting struck by lighting. It's not impossible, but so improbable that it might as well be.