NATO's secretary-general on Sunday talked of the importance of a global response in dealing with North Korea during an interview with BBC television.

“The reckless behavior of North Korea is a global threat and requires a global response and that of course also includes NATO,” said Jens Stoltenberg, head of the military alliance, according to Reuters.

"We are now totally focused on how we can contribute to a peaceful solution of the conflict."

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Stoltenberg said there isn't a simple solution in handling the North Korean threat.

“There is no easy way out of this difficult situation," he said.

"But at the same time we have to ... continue to work for political solution, continue to press also the economic sanctions.”

North Korea in recent months has repeatedly provoked the U.S. and other countries as it works toward creating a successful nuclear weapon.

Last week, Trump warned North Korea to stop "behaving badly."