U.S. weighs response to Sony hacking attack blamed on North Korea

By David Brunnstrom WASHINGTON (Reuters) - The United States was considering possible options on Thursday in response to a major cyber attack on Sony Pictures blamed on North Korea, amid calls for tougher sanctions on Pyongyang to cut it off from the global banking system. U.S. experts say options for the Obama administration could include cyber retaliation and financial sanctions but the effect of any response could be limited given North Korea's isolation. ...