Dozens of companies have joined an experimental program to participate in Ukrainian air defense operations.

Ukrainian drones ignite Syzran oil refinery deep inside Russia; ISW says Ukraine regaining the initiative on frontline. What we know on day 1,549

A clear route into the E.U. could be vital for President Volodymyr Zelenskyy to sell any peace settlement with Russia to Ukrainians.

Ukraine has been recapturing some territory and in other areas are stalling Russian forces, but drones have made it much harder to determine just who controls what in the volatile grey zone.

Russia says "nuclear munitions" sent to Belarus for joint drills in the country that Moscow used as a launchpad for its 2022 invasion of Ukraine.

Friction has grown between Congress and the administration as lawmakers seek updates on $400 million in delayed Ukraine aid and $200 million for Baltic defense.

Since Russia launched its full-scale invasion of Ukraine four years ago, the embattled country has received varying degrees of support from the U.S. in its efforts to stave off Russia. On the campaign trail, President Donald Trump repeatedly vowed to end the war within a day of taking office. In reality, his signals have been far more mixed.

Ukraine disabled Russia's satellite technology, reportedly sparking chaos and friendly fire incidents on the frontline.