South Korea’s spy agency said Friday a wounded North Korean soldier who was captured while fighting for Russia against Ukrainian forces has since died from his injuries, the Yonhap news agency reported.

According to South Korean officials, around 11,000 North Korean soldiers have been sent to Russia so far, with indications of preparations for further troop and military equipment deployment. Thousands of North Korean soldiers have already died serving Russia in the Ukraine War.

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.