The crisis in Ukraine has countries formerly in Russia's orbit fearing Putin's next moves.

We’re still looking at a range of possibilities, including de-escalation and a great-power conflict.

Chaos creates countless opportunities for mistakes.

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

Images from recent weeks, showing a region reshaped by a year of war

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.