>I think they already crossed that line (publicly):
>
>http://www.crimesofwar.org/onnews/news-yemen.html

Don't know which version of the story of how WWI began is taught here - I figure the Austrian one, where Serbs were to blame. After Gavrilo Princip assasinated Ferdinand in Sarajevo (and Bosnia was de facto occupied territory at the time), Austro-Hungarian empire cast doubt on Kingdom of Serbia, that its government was involved or had sponsored the group.

They issued the ultimatum, in ten articles, demanding several things from Serbia. The government, wanting to avoid a war (it just finished the final wars with the Ottoman Empire and the Balkan war year before) agreed with nine of ten points - the tenth, refused, point being that the K&K monarchy had the right to send police into Serbia and do their own investigation. That was just too much, and was deemed a vast breach of rules of sovereignity. Since Austria wasn't satisfied with anything less than full obedience, the WWI began.

Now imagine a foreign country not just doing police work in your country, but factually assasinating the suspects. Anyone caught doing that would be rightfully shot on the spot in any country worth its name, or at least incarcerated indefinitely.

The only reason, IMO, that the other countries are tolerating the CIA operating in this manner is that they still think they can achieve much by reacting to it. Once their perception changes, they will surely do something about it.