NY Times 
November 3, 2013
When Ban Ki-moon, the United Nations secretary general, sat down with President Obama at the White House in April to discuss Syrian chemical weapons, Israeli-Palestinian peace talks and climate change, it was a cordial, routine exchange.
The National Security Agencynonetheless went to work in advance and intercepted Mr. Ban’s talking points for the meeting, a feat the agency later reported as an “operational highlight” in a weekly internal brag sheet. It is hard to imagine what edge this could have given Mr. Obama in a friendly chat, if he even saw the N.S.A.’s modest scoop. (The White House won’t say.)
But it was emblematic of an agency that for decades has operated on the principle that any eavesdropping that can be done on a foreign target of any conceivable interest — now or in the future — should be done. After all, American intelligence officials reasoned, who’s going to find out?
From thousands of classified documents, the National Security Agency emerges as an electronic omnivore of staggering capabilities, eavesdropping and hacking its way around the world to strip governments and other targets of their secrets, all the while enforcing the utmost secrecy about its own operations. It spies routinely on friends as well as foes, as has become obvious in recent weeks; the agency’s official mission list includes using its surveillance powers to achieve “diplomatic advantage” over such allies as France and Germany and “economic advantage” over Japan and Brazil, among other countries.