The US President says intelligence agencies will no longer spy on other world leaders - unless there is a compelling national security purpose.
Barack Obama has today announced what he describes as a series of concrete and substantial reforms - to ensure greater transparency in its surveillance
He also says it will take years to assess the damage to American security caused by Edward Snowden's disclosures of classified information.
President Obama says US agencies - including the NSA - will not routinely spy on the communications of other leaders:
