Samuel Nunn: “The nuclear threat has fundamentally changed since the end of the Cold War.”

The key to solving the North Korea nuclear problem without a war is working with China. So alienating China--you pay a price for that.

I agree with Chairman Corker, Russia has been less than effective in dealing with its nuclear program.

We should play it methodically, confident in our enduring strengths, and unapologetic about our values.

Russia's recent flagrant actions indicate that its national interests sharply differ from America's national interests in important places, most acutely in Ukraine, in Europe, and in Syria.