WASHINGTON, Jan 3 (agencies): North Korea was hit with more sanctions on Friday designed to impede access to the U.S. financial system in the wake of a cyberattack on Sony Pictures Entertainment, which the Obama Administration has said was supported by the reclusive country.
The U.S. government named three entities, including North Korea's military intelligence agency, and sanctioned 10 people with links to weapons sales and proliferation.
Financial sanctions have been effective in bringing pressure on Iran and Russia, but they have had limited impact on North Korea, which has been sanctioned by the United States for more than 50 years.
Obama said he ordered the sanctions because of "the provocative, destabilizing, and repressive actions and policies of the Government of North Korea, including its destructive, coercive cyber-related actions during November and December 2014."
The activities "constitute a continuing threat to the national security, foreign policy, and economy of the United States," he added, in a letter to inform congressional leaders.
"The order is not targeted at the people of North Korea, but rather is aimed at the Government of North Korea and its activities that threaten the United States and others," Obama added.
The sanctions come after hackers penetrated Sony's computers in late November, stealing and releasing over the Internet employee information, unreleased films and an embarrassing trove of emails between top company executives.
The hackers-a group calling itself Guardians of Peace-then began to issue threats against the company over the looming Christmas release of the comedy film "The Interview", which depicts a fictional CIA plot to kill North Korea's leader.
The threats led first to worried movie theater owners dropping the film and then Sony cancelling the public debut altogether, before releasing it online.
After the hackers invoked the 9/11 attacks in their threats, the White House branded it a national security threat, and an investigation by the FBI said North Korea was behind the Sony intrusion.
Pyongyang repeatedly denied involvement, but has applauded the actions of the shadowy Guardians of Peace group.
The White House stressed Friday that its response will be "proportional", but also that the sanction actions were only "the first aspect of our response."
"We take seriously North Korea's attack that aimed to create destructive financial effects on a US company and to threaten artists and other individuals with the goal of restricting their right to free expression," said White House press secretary Josh Earnest.
In parallel with the White House announcement, the Treasury named the first targets of sanctions in the Sony case.
They included the Reconnaissance General Bureau, the government's main intelligence organization, and two top North Korean arms exporters: Korea Mining Development Trading Corporation (KOMID) and Korea Tangun Trading Corporation.
The individuals named included agents of KOMID in Namibia, Russia, Iran and Syria, and other representatives of the government and the sanctioned organizations.