If we have a good relationship with them, we should of course, ask permission and work with them to ferret the terrorists out. If we do not, and they are known to harbor terrorists, absolutely we should use drones to figure out where they are and take them out if necessary. However, it should also be noted that caution should be taken when considering the military capability of enemy countries and how likely they are to start a war over such action. Carrying out such an action in Russia or China for instance, might not be the best idea if we don't want a war.
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