The Russian president's actions in Ukraine aren't in keeping with the spirit of D-Day.

Readers fret over the fate of Ukrainians—and the dangers of escalation.

The Russian military isn’t just bombing civilians. It’s also targeting the laws and values that protect human rights.

Putin’s template is simple: flatten cities, install satraps, rule by fear.

Wars are won or lost well behind the front lines. Allies should arm Ukrainians accordingly.

Not only did the president hold up aid to Ukraine; he made its release contingent on a statement advancing his own political interests.

Over the weekend in Ukraine's breakaway republic of Donetsk, self-proclaimed authorities celebrated International Women's Day by holding a beauty pageant. The contestants were all female soldiers fighting with pro-Russian rebels in eastern Ukraine.

Allies can be exasperating. But try being invaded by your neighbor and lectured by everyone else.

The faction that obsesses about maintaining American credibility does the most to risk undermining it.

Eastern Ukraine is home to nine-tenths of the country's coal and one of Europe's largest shale-gas deposits. Will the region soon be Moscow's?