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

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Crash their's.

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Would Russia be committing an act of war against the USA if they hacked our computer systems, crashed them and caused severe dislocation and economic loss to the USA domestic population?

What if you personally lost your job and a year's salary because of this economic dislocation? Would you then consider Russia's hacking to be an act of war? What if 50 million US citizens experienced this kind of huge economic loss because of the hack-job?

Would the smartest International Law Expert in the Universe consider it an act of war?

I started this thread because I'm not sure whether the answer is settled.

We know that if one nation launches missiles or shells into another country's land and causes economic loss, this is an act of war.

What if the same kind of mass economic destruction is caused not by shells but by a malicious computer program "launched" over the internet?