Trump spoke directly with Zelenskyy and European leaders early Saturday about the U.S. potentially joining a NATO-style security guarantee for Ukraine as part of a deal with Russia, according to two senior administration officials and three sources familiar with the discussions.

As the front lines froze, and air defenses got better, Russia and Ukraine pivoted away from close bombing runs to standoff attacks.

President Trump visits Alaska Friday for a meeting with Russia's President Vladimir Putin — a discussion the White House has called a "listening exercise."