China not enemy but poses security challenges, NATO's Stoltenberg says

"China is coming closer to us. We see them in cyber space, we see China in Africa, but we also see China investing heavily in our own critical infrastructure," he told reporters at NATO headquarters before leaders began arriving for the summit.

"We know that China does not share our values...we need to respond together as an alliance," he said, adding that China was not an enemy or an adversary.