U.S. envoy Steve Witkoff calls Ukraine and Russia's exchange of 314 prisoners "tangible progress," but acknowledges a lot of work left to end the war.

Kyiv is trying to hammer out concessions from Moscow and iron-clad security guarantees from its allies to end the war as Russia appears to dig in on territorial claims.

Seizing on the frigid weather, Russia has launched an all-out assault on Ukraine’s energy infrastructure, with the apparent aim of keeping up pressure amid ongoing peace negotiations—and sapping public morale.

U.S., Russian and Ukrainian negotiators are back around a table for a second round of technical talks, but in Kyiv, Russian bombs bring suffering and skepticism.

Ukrainian President Volodymyr Zelenskyy announced over 55,000 military casualties as peace talks continue in Abu Dhabi this week.