We focus too much on military force instead of considering economic, technological, social, and political structures.

Kyiv needs to show Russians that the war is not worth fighting.

Whether we wish it or not, we are again in the world of war.

As Russia confronts Ukraine, the definition of modern military intervention hangs in the balance.

U.S. leaders need to talk to the Russians, not threaten them.

The country’s young people have been forced to make decisions much tougher than most adults are capable of. I feel some small sense of common cause.

Conflicts, though typically started easily, can be brutal, intractable, and difficult to end.

Anything helps—we shouldn’t overthink it. But we should still, well, think it.

He is threatening to invade Ukraine because he wants democracy to fail—and not just in that country.

Ukrainians have fought not only for their own country, but also for Europe, giving the EU a powerful reminder of why it was founded in the first place.