The United States has imposed new sanctions on North Korea as part of its first response to the cyber attack on Sony Pictures.
The FBI has blamed North Korea for the attack which leaked confidential data from Sony computers.
North Korea has denied the allegation but expressed fury over Sony's comedy The Interview, which features a plot to assassinate leader Kim Jong Un.
US President Barack Obama has said Sony Pictures "made a mistake" in cancelling the release of movie The Interview after threats from hackers who breached the film company's security system.
"I wish they had spoken to me first," Mr Obama said while taking questions at the White House.
"I would have told them: 'Do not get into a pattern in which you are intimidated by these kinds of criminal attacks.'"
Mr Obama said the US would make a "proportionate response" to North Korea "when we choose" after the FBI blamed Pyongyang for the cyber attack on Sony's computer systems.
He confirmed the US had no indication North Korea worked with any other nation in conducting the cyber attack.
North Korea's dispute with the US over computer hacking took a new twist when the communist state lost Internet access for several hours.
A hacker group who claimed to be behind a cyber attack on Sony Pictures have posted a message online apparently mocking the FBI.
Events company Secret Cinema is planning to screen a film in protest at what they have called the 'censorship' of The Interview.