When the week began, the president faced questions about Ukraine. Now the inquiry has gone global.

Before giving Kyiv the weapons that it needs, the U.S. always works through a list of excuses.

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.

Congressional Republicans are blocking crucial aid to Israel and Ukraine out of sheer servility to Trump.

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

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.

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.

Did Obama’s refusal to strike Syria really give Putin the green light in Ukraine?