Former National Security Agency contractor Edward Snowden leaked the United States intelligence budget for the 2013 fiscal year to The Washington Post Thursday, revealing that U.S. spy agencies are unable to uncover what The Post calls "blind spots," where information on questions of national security remains sparse.

Despite massive spending and a broad network of surveillance and international espionage facilities, the budget reportedly explains that many key national security questions continue to elude the U.S. intelligence community. Intel on biological and chemical weapons is thin, more than a week after an alleged chemical weapons attack in Damascus may have killed as many as 1,300 people.

North Korea and its nuclear program -- despite the U.S.'s efforts to "all but (surround) the nuclear-armed country with surveillance platforms" -- also continues to bewilder intelligence authorities.

"Analysts know virtually nothing about the intentions of North Korean leader Kim Jong Un," The Post reported.

The Russian, Iranian and Chinese governments are also reportedly "difficult to penetrate," and the U.S. has directed intelligence efforts at its international allies, including Israel and Pakistan, as well.

The Post reports that the highly classified 178-page "black budget" itemized $52.6 billion in spending for the nation's 16 spy agencies.

The Central Intelligence Agency (CIA)'s reported request for $14.7 billion in public funds far surpassed any other agency, including the National Security Agency, which is at the center of a public scandal after Snowden revealed it had kept tabs on U.S. citizens and various international parties in a series of leaks to the British newspaper The Guardian.