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.

North Korea has not responded to reports of its troops captured or killed by Ukraine forces. It has never publicised the deployment or large shipments of North Korean artillery shells and other weapons sent to Russia to help its war against Ukraine, although they marked the country’s first intervention in a major armed conflict overseas in decades.

According to the Institute for the Study of War, North Korean troops in Ukraine could cease to exist by mid-April. The losses amount to nearly 100 soldiers per day. The Institute for the Study of War (ISW) reported that North Korean troops in Ukraine may cease to exist by mid-April.