It is happening in slow motion, to be sure. But we are witnessing how a nuclear armed Iran is changing the face of the Middle East. For years, US leaders, including President Barack Obama warned that a nuclear armed Iran would spark a regional arms race. And this is happening. As the Wall Street Journal's Bret Stephens noted this week, Turkey signed a nuclear cooperation agreement with Japan that includes "a provision allowing Turkey to enrich uranium and extract polonium, a potential material for nuclear weapons." Saudi Arabia has long had a nuclear cooperation deal with Pakistan, whose nuclear weapons...