> What are the motives for leaking information regarding our actions on foreign soil against foreign citizens?
1. Removing plausible deniability. "Well we might be deeply involved in domestic surveillance but we certainly don't do it outside the US!". The laws that enabled the NSA to do the surveillance were attributed to accessing data that traveled outside the US.
2. Demonstrating the power and reach for legitimacy/plausibility.
I'm sure I can come up with more than the first 2 minutes it took to assemble this post.