Sony hack fallout: What can the U.S. do against North Korea?

What seemed an unlikely twist in a cheap Hollywood thriller is now reality: the U.S. government has publicly accused North Korea of hacking Sony Uncle Sam's finger has been pointed, and President Barack Obama has made a promise to respond "proportionately" sometime in the future. Meanwhile, North Korea has denied any responsibility and even offered to help in a joint investigation See also: Why it's possible North Korea was behind the Sony hack But what can the U.S. [...]
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