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.

A wounded North Korean soldier captured by Ukrainian forces in Russia's Kursk region earlier this month told interrogators that Pyongyang's troops fighting for Moscow are suffering major losses. Ukraine said last week that it captured two North Korean soldiers in the border region and posted videos of their interrogation,

North Korean leader Kim Jong-un reportedly sent New Year’s messages to North Korean soldiers deployed in Russia's war against Ukraine, urging them to "fight with courage" until the end, according to a news report.