THAT is the biggest question about EMP. Would we strike back (and don't think we wouldn't know who did it)? Would we strike back with our own EMP, all out nukes on their soil or full scale invasion of troops?The thing about EMP if a country used it against use we would attack them as well.
I had this discussion with a friend of mine once and he strongly leaned for an all out nuke retaliatory attack, screw the UN and human rights. They would be burned bacon. I tend to agree.