More than 1,000 North Korean soldiers were killed or wounded fighting Ukrainian troops in Russia’s Kursk region in the past week, and a few chose suicide over surrender, the Biden administration said on Friday.

North Korean troops were evidently untrained in dealing with Ukrainian drones, which took a high toll. In one instance, Ukrainian drone operators recorded how a North Korean soldier accidentally shot his comrade as they tried to shoot down the drone that was filming them.

The first North Korean soldier taken prisoner of war by Ukrainian forces while fighting for Russia has died of his injuries, South Korean intelligence said Friday.