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NATO Secretary-General Jens Stoltenberg briefs the media during a NATO defence ministers meeting at the Alliance headquarters in Brussels, Belgium, June 14, 2016. REUTERS/Francois Lenoir

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BERLIN (Reuters) - A major cyber attack could trigger a collective response by NATO, NATO Secretary General Jens Stoltenberg said in an interview published by Germany's Bild newspaper on Thursday.

"A severe cyber attack may be classified as a case for the alliance. Then NATO can and must react," the newspaper quoted Stoltenberg as saying. "How, that will depend on the severity of the attack."

He spoke after a decision this week by NATO ministers to designate cyber as an official operational domain of warfare, along with air, sea, and land.

In 2014 the U.S.-led alliance assessed that cyber attacks could potentially trigger NATO'S mutual defence guarantee, or Article 5. That means NATO could potentially respond to a cyber attack with conventional weapons, although the response would be decided by consensus.

The NATO chief told Bild that the alliance needed to adjust to the increasingly complex series of threats it faces, which is why NATO members have agreed to defend against attacks in cyberspace just as they do against attacks launched against targets on land, in the air and at sea.

The United States and other NATO states have become increasingly vocal about cyber attacks launched from Russia, China and Iran, but officials say it remains hard to determine if such attacks stem from government bodies or private groups.

Recognizing cyber as an official domain of warfare will allow NATO to improve planning and better manage resources, training and personnel needs for cyber defence operations, said a NATO official, speaking on condition of anonymity.

The official stressed that NATO's cyber activities would remain purely defensive. "We have no offensive cyber doctrine or offensive cyber capability. And there are no plans for NATO as a body to use such capabilities. NATO's core cyber defence task is to defend NATO's own networks," said the official.

Individual members have already declared cyber an operational warfare domain, including the United States, which said in 2011 that it would respond to hostile attacks in cyberspace as it would to any other threat.

(Reporting by Andrea Shalal; Editing by Dan Grebler and Mark Heinrich)

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