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"Increasingly, however, the openness that enables the United States to build networks, maintain institutions, and sustain alliances is itself under siege. This is why the most important challenge to the provision of world order in the twenty-first century comes not from without but from within."

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.

"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?"

The defining question about global order for this generation is whether China and the United States can escape Thucydides’s Trap. The Greek historian’s metaphor reminds us of the attendant dangers when a rising power rivals a ruling power—as Athens challenged Sparta in ancient Greece, or as Germany did Britain a century ago. Most such contests have ended badly, often for both nations, a team of mine at the Harvard Belfer Center for Science and International Affairs has concluded after analyzing the historical record. In 12 of 16 cases over the past 500 years, the result was war. When the parties avoided war, it required huge, painful adjustments in attitudes and actions on the part not just of the challenger but also the challenged.

In the United States and Europe, many believe that the best way to prevent Russia’s resumption of its historic imperial mission is to assure the independence of Ukraine. They insist that the West must do whatever is required to stop the Kremlin from establishing direct or indirect control over that country. Otherwise, they foresee Russia reassembling the former Soviet empire and threatening all of Europe. Conversely, in Russia, many claim that while Russia is willing to recognize Ukraine’s sovereignty and territorial integrity (with the exception of Crimea), Moscow will demand no less than any other great power would on its border. Security on its western frontier requires a special relationship with Ukraine and a degree of deference expected in major powers’ spheres of influence. More specifically, Russia’s establishment sentiment holds that the country can never be secure if Ukraine joins NATO or becomes a part of a hostile Euro-Atlantic community. From their perspective, this makes Ukraine’s nonadversarial status a nonnegotiable demand for any Russia powerful enough to defend its national-security interests.

"In our view, the field has moved away from a careful reliance on theory, and is just mindlessly going out and testing hypotheses without thinking very hard about what's really causing what."

Read an excerpt in The Times of India from a new book on Lee Kuan Yew by Belfer Center Director Graham Allison and Ambassador Robert D. Blackwill, with Belfer Center Associate Ali Wyne. The book is titled: Lee Kuan Yew: The Grand Master's Insights on China, the United States, and the World.

The upcoming transition in North Korea’s leadership will not inevitably bring about a collapse of government, but the potential consequences of such an event necessitate advance and combined planning. It is imperative that China, South Korea, and the United States develop a coordinated response, as each of these countries could take destabilizing action to protect their individual interests. A relatively benign collapse could require 260,000 to 400,000 troops to gain control of North Korea’s nuclear weapons, prevent humanitarian disaster, manage regional refugees, and ensure stable U.S.-Chinese relations. Civil war or war on the peninsula would only increase these requirements.