The U.S. president has promised Ukraine “whatever it takes, as long as it takes.” But out of anxiety about escalation, Washington is making decisions that could prolong the war.

Ever since the earliest years of this century, Ukraine has been the contested frontier in a grand ideological struggle.

A roadmap for responding to Moscow’s aggression

What we’re doing when we make erratic posts about Ukraine

The country's regional differences only reflect part of its ethno-linguistic mosaic.

The late senator would have rallied the West to embrace its obligation to advance the cause of freedom and justice in the world.

What the U.S. president may have in mind when he tweets about teaming up with Putin “to solve North Korea, Syria, Ukraine, terrorism”

Putin’s military may seek to recover from its early mistakes with increased brutality.

Because every witness and even the president are telling essentially the same story about Ukraine, the suspense has gone out of the inquiry.

There may be a 'ceasefire' in eastern Ukraine, but that's cold comfort for the war's survivors.