Governments in Japan and South Korea are warning people of the North Korean nuclear threat with comic books and emergency drills.

Are there any checks in place to keep the U.S. President from starting a nuclear war?

The plan includes evacuation drills for school students and announcements that say “get inside, stay inside, and stay tuned."

Hosting his last nuclear security summit, Obama said the world has measurably reduced the risk of nuclear terrorism by taking "concrete, tangible steps."

The U.S. government isn't fully prepared to handle a nuclear terrorist attack or a large-scale natural catastrophe, lacking effective co-ordination, and in some cases is years away from ensuring adequate emergency shelter and medical treatment.