NATO slammed on Tuesday the release of thousands of US confidential documents as "illegal, irresponsible and dangerous," according to spokeswoman Oana Lungescu.
"As a matter of policy we won't comment on classified information and we strongly condemn the leaking of confidential documents," Longescu insisted.
"It is illegal, irresponsible and dangerous, regardless of whether the leaked material is diplomatic or military," she underlined.
WikiLeaks at the weekend began releasing around 250,000 sensitive US diplomatic cables, after two other leaks this year involving hundreds of thousands of classified files on the US wars in Iraq and Afghanistan.
The whistleblowing site's Australian founder Julian Assange on Tuesday appealed to Sweden's Supreme Court to overturn a ruling he should be detained for questioning on allegations of rape.