Oliver Stone has taken aim at the US government for deceiving people about the levels of surveillance that exist in the country. His new film Snowden, about the controversial NSA informant Edward Snowden, received its world premiere. The drama ... tells of the former CIA employee's discovery that the agency had constructed a system to spy on the public. "Americans don't know anything about it because the government lies about it all the time," Stone said at a press conference. "What's going on now is pretty shocking. This story not only deals with eavesdropping but mass eavesdropping, drones and cyberwarfare. As Snowden said himself the other day, 'It's out of control, the world is out of control.'" The film also features a cameo from Snowden himself, who still resides at an undisclosed location in Russia while he searches for asylum elsewhere. Stone hopes that he may return to US ground but is doubtful. "Obama could pardon him and we hope so," he said. "But he has vigorously prosecuted eight whistleblowers under the espionage act, which is an all-time record for an American president, and he's been one of the most efficient managers of this surveillance world. It is the most extensive and invasive surveillance state that has ever existed and he's built it up." The film-maker ... likens [the current situation] to a George Orwell novel. "I never thought this could happen," he said. "But from 2001 on, it's very clear that something radical has changed. There's more to it that meets the eye and whatever they tell you, you've got to look beyond."