 Gregory Copley, editor and publisher of Defense and Foreign Affairs. We turn now to matters that are of great concern to us about nuclear weapons and what are they good for here in the 21st century. North Korea is always boasting of its nuclear weapons. Mr. Putin is taking to talking about his. What about the U.S. and the so-called nuclear umbrella when we come back? This is CBS Eye on the World. I'm John Bassett.