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All the world's nuclear-armed states (except for North Korea) have begun modernizing and upgrading their arsenals, leading many observers to predict that the world is entering a new nuclear arms race. While that outcome is not yet inevitable, it is likely, and if it happens, the new nuclear arms race will be different and more dangerous than the one we remember. More nuclear-armed countries in total, and three competing great powers rather than two, will make the competition more complex. Meanwhile, new non-nuclear weapon technologies — such as ballistic missile defense, anti-satellite weapons, and precision-strike missile technology — will make nuclear deterrence relationships that were once somewhat stable less so.

Decision-makers often seek to design policies that support sustainable development. Prospective evaluations of how effectively such policies are likely to meet sustainability goals have nonetheless remained relatively challenging. Evaluating policies against sustainability goals can be facilitated through the inclusive wealth framework, which characterizes development in terms of the value to society of its underlying capital assets, and defines development to be potentially sustainable if that value does not decline over time.

The fall of Aleppo is a human catastrophe. It’s also a demonstration of the perils of choosing the middle course in a military conflict. Sometimes it’s possible to talk and fight at the same time. But in Syria, the U.S. decision to pursue a dual-track, halfway approach made the mayhem worse.

"For nearly a century, in short, offshore balancing prevented the emergence of dangerous regional hegemons and pre­served a global balance of power that enhanced American security. Tellingly, when U.S. policymakers deviated from that strategy—as they did in Vietnam, where the United States had no vital interests—the result was a costly failure."

"I think that he has on some level grasped the difficulties I mentioned a moment ago: the difficulties of counterinsurgency and nation building, the limits of American power. I think he has acted on the basis of those convictions. I think he has a fundamental faith in diplomacy, which I think is right. He understands that diplomacy and negotiations can be a very powerful tool in the tool kit of American strategists, and I think that he is exactly right. So I am appreciative of the fact and supportive of the fact that he has pursued negotiations with Iran most notably, also with Cuba."

"The world—and our foreign policy—requires a broader vision than a fixation on terrorism and the troubled Middle East. American foreign policy will be central to the long-term global balance of power and the production of public goods—but can the next American President explain that to a public that has become entranced with the crisis du jour?"

Iran’s top nuclear negotiator was heading back to Tehran on Sunday to consult with his nation’s leadership, as negotiators remained divided over how to limit and monitor Tehran’s nuclear program and even on how to interpret the preliminary agreement they reached two months ago.