Ukrainian forces described a different kind of enemy, fighting with unfamiliar tactics and little option to retreat.

Weapons and notes left on dead North Korean troops in Russia give Ukraine a glimpse into their mindset — and show how they are quickly adapting to modern war.

Western officials have told the BBC that North Korean troops have already suffered nearly 40% casualties in the fighting in Russia's western Kursk region, in just three months. The officials, who spoke on grounds of anonymity,