My take on this is as it's been for some time, and is for a number of other issues too....
The US should not have an official stance advocating or allowing for for assassinations.
The US should absolutely make use of assassinations, specifically against countries or forces who have no such similar agreement to refrain from such.
If the people authorizing and conducting said assassinations are found out they need to be disowned immeidetely and punished to the fullest extent possible; they fail at their job if they are found out.
I also fully expect every other "civilized" nation to take a similar stance.