Israel is attacking Iran’s nuclear sites, but Tehran’s secret path was blazed by the Israelis. “Remember, Iran cannot have any nuclear weapons. Very simple. Don’t have to go too deep into it. They just can’t have nuclear weapons.”

“Certainly, North Korea doesn’t rue the day it acquired nuclear weapons,” said Christopher R. Hill, who led lengthy, ultimately unsuccessful, talks with Pyongyang in 2007 and 2008 to try to persuade it to dismantle its nuclear program.