Russia and Ukraine have reached an agreement that will keep natural gas supplies flowing until March of next year.

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.

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

Chaos creates countless opportunities for mistakes.

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

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

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

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