You're under the jurisdiction of the country you reside.I think it comes down to - when you're on a computer, and you connect to another computer over the internet that's in a different country, who's jurisdiction are you under? The country your computer is in, or the country of the computer you are connecting to?
One country's laws do not apply to another. Obviously there can be things like extradition treaties, etc, but ultimately you're under the jurisdiction of the country you are in.