About 12,000 North Korean soldiers have been sent to Russia, according to Ukrainian officials and Western intelligence reports, which say around 4,000 those troops have been killed or injured.

On Jan. 8, Ukrainian drones flew at least 400 miles to strike near the Russian air force’s Engels bomber base in the city of Saratov in southern Russia. The blasts triggered a blaze at a ...

The disintegration of the Ukrainian army’s 155th Mechanized Brigade reportedly taught Ukrainian leaders an important lesson—one that could help outnumbered Ukrainian troops hold the line as ...