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“We are also expanding our cooperation in another area and that is the challenges related to hybrid warfare,” said Stoltenberg.

The official added that the threats are a "combination of military and non-military means, covert and overt operations." "There is really a need for close cooperation between the EU and NATO,” the NATO chief said.

Read alsoNew challenges for NATO: adaptation through flexibilityStoltenberg suggested cooperation on such issues “as early warning, as supporting and defending critical infrastructure as energy infrastructure. And of course when it comes to cyber.”

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Read alsoRussia tries to divide NATO – StoltenbergThe official stressed he believes both the EU Summit in June and the NATO Summit in July will be important milestones for expanding cooperation.