Snowden is played by actor Joseph Gordon-Levitt, and is seen going from military training to joining the CIA before uncovering the NSA's extent of spying on the American public and handing the information over to journalists.

The film, which also stars Shailene Woodley and Nicolas Cage, is due in theaters on September 16.

Official Trailer for Oliver Stone's “Snowden” Was Released

Snowden, 32, whose supporters say he boldly exposed government infringements of privacy, fled the United States in May 2013 and now lives in Russia where he was granted asylum.

The U.S. government filed espionage charges against him for leaking intelligence information.